Catted vs catless downpipe bmw. Bimmerpost ☰ Model Selection.

Catted vs catless downpipe bmw The catted option is better for the stock turbo; it's louder than stock but not raspy and has a deeper mid-range tone. Don't overthink it. The idea of a downpipe upgrade is to reduce back-pressure. Hey guys ! I have a 2020 330i b46 and was wondering what's the best downpipe and the difference between catted and catless. We’ll somewhat dive into the specific performance gains of catless vs catted F90 M5 downpipes below. Explore a comprehensive comparison between catted and catless downpipes, examining performance, emissions, sound, and other considerations that influence your choice. I'm looking at the VRSF B58 catless and high flow catted Downpipe. What do you think sounds better? Apr 22, 2014 · BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > Catted downpipes vs catless downpipes Google Search Oct 7, 2022 · 2022 X3 M40i Hi, new to the community here with my first Bimmer as an M40i. On a rear wheel drive, that should keep things lively enough Need to keep things legal, so catless isn't on the cards sadly. Catted Downpipes - Page 3 Bimmerpost ☰ Model Selection Performance Parts For Your Bmw At Crazy Low Prices! Email: info@mad-us. https://www. 5″ BMW X3 M40iX G01 & X4 M40iX G02 B58 Stainless Steel Downpipe 3 inch VRSF Catless downpipe VS 3 inch mmp catless downpipes OR the 3 inch VRSF Catted downpipe. VRSF Racing Downpipes B48 G & F Chassis 2016 – 2021 BMW 120i, 220i, 230i, 320i, 330e, 330i, 420i, 430i, 630i, 730i & xDrive SKU: 10302075 Rated 4. There's too much focus on maximizing every once of power in the online community but at what compromise? I'm shooting for 400-425whp that I can daily. Bringing even more performance & exciting exhaust sounds to your vehicle. More on the specific gains of each in the next section. Apr 7, 2020 · B46/B48 Catless vs High-Flow Catted Downpipe Catless downpipes are the least restrictive option, and will therefore provide the best power gains. ⁣ ⁣ Our BMW G8X HFC downpipes utilize GESI GEN1 UHO metal-core 300cpsi cats, rated for 500-800 horsepower applications. If you want the power, with no fuel smell and a slight upgrade in exhaust tone catted is the way to go Dec 19, 2021 · Catless downpipes with a tune usually net about 20-30 whp and 30-50 wtq. F30 is a sub dedicated to all things 2011 - 2019 BMW 3 series. Long story short. 4K views 54 replies 9 participants last post by williams Aug 29, 2019 Power gains are the same on catted vs catless with stock turbo Catless sounds more aggressive but smells, catted does not smell. Aug 25, 2019 · Catless downpipe? Jump to Latest 8. By replacing the factory downpipe/catalytic converter with our Sports Series High Flow Metallic Catted Downpipe, more power is unleashed! We use a 200 cell metallic core for our Sports Series High Flow Catted Downpipes. I don’t really care about inspection tests as I don’t need to get them here in Canada. They also promised to replace it if there was one The first time I got a CEL (unrelated to Downpipe) they were very helpful and were ready to replace it when I called. Let’s break down your options. If you don’t need the catted downpipe for emission regulations, I would recommend choosing the catless downpipe for optimal sound and performance. Catted vs catless down pipe? Hub for all BMW 3 series, 2006-2013. Catless for faster and louder spool. In addition to the massive power gains, these downpipes open up an incredible exhaust sound from the turbocharged V8 that will shock and awe onlookers! The cost of a catless exhaust system typically ranges as follows: Catless Downpipe: $150 - $800 Catless Full Exhaust System: $400 - $2,000 Installation: $100 - $500 Prices depend on the vehicle model and brand. Ordered the 3″ catless downpipes for my n54 335i. Discover the key differences between catted and catless downpipes for your BMW. I could use advice on this. Of course, each state has different laws, so it's not 100%. Jul 2, 2020 · *Continuing the trend, high-flow catted S55 upgraded downpipes are louder than stock but to less of an extent than catless DP’s. Please note that the warranty on the catted downpipe is limited to two years. Upgraded downpipes help reduce backpressure and improve turbo spool, which results in impressive performance gains. The B48 downpipe fits the BMW 120I 125I 220I 230I 320I 330E 330I 420I 430I 520I 530I 530E 630I 730I 740E X3 X4 20I 30i F40 M135I X1 F48 X2 F39 MINI F54 F55 F56 F57 F60 COOPER S JCW Apr 3, 2024 · About Press Copyright Contact us Creators Advertise Developers Terms Privacy Policy & Safety How YouTube works Test new features NFL Sunday Ticket Press Copyright The CTS Turbo downpipe for the BMW B46 North American Market vehicles is made to maximize exhaust flow for the highest power gains. BMW 3-Series and 4-Series Forum (F30 / F32) | F30POST > Technical Forums > B58 Turbo Engine / Drivetrain / Exhaust Modifications > 4. back to the point of the thread: Downpipe!! I want to run Stage2 and push for around 460 horses, so a pipe is definitely needed. Oct 5, 2020 · For a quick answer, catted downpipe is better than catless downpipe if you are driving on the street – especially if the car is a daily driver. Aftermarket downpipes prioritize flow and power gains. I dont think I will pass inspection with a catless downpipe but I still want that aggressive tone to my exhaust. This bounce back creates resistance for the turbo compressor, which reduces spool. #car #cars #bmw #440i”. Apr 10, 2022 · Comparison of the stock exhaust, a dual resonator delete, and the dual res delete with the Active Autowerke high flow catted downpipe. Purchasing a VRSF downpipe comes with peace Yes, a catless downpipe will sound noticeably more aggressive. The catback is APR which stays the same in b Jan 31, 2022 · Catless vs. BMW 3-Series and 4-Series Forum (F30 / F32) | F30POST > 2012-2019 BMW 3 and 4-Series Forums > General F30 Sedan / F32 Coupe / F36 Gran Coupe Forum > Best Downpipe For B58 Google Search Search Forums Nov 9, 2012 · BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > Catted vs Catless Downpipes Google Search Dec 10, 2024 · Emissions and Environmental Impact Emission control is one of the most significant differences between catted and catless downpipes. 5″ downpipe upgrade is THE best bang for the buck mod available for your N55 135i & 335i/xi. They are also cheaper to produce since the catalytic substrate costs a good deal of money, plus the fitment of a strait section of wider pipe always makes plumbing more difficult than the simple strait piping of a catless design. May 15, 2024 · Depends on the catted downpipe but I would say our catless is about 30-40% louder +- 10% depending on the rest of the exhaust. This limits not only the amount of power N20 can make on the stock tune, but also prevents upgrading to a stage 2 tune due to excessive back-pressure. I have an mst intake & bm3 stage 1! All VRSF downpipes are hand crafted from SS304 grade stainless steel and include a lifetime warranty as well as our “No Hassle” satisfaction guarantee (includes fitment). The CTS Turbo Catless Downpipe BMW B58 is made to maximize exhaust flow for highest power gains. Works very well on Stage 2, 2 Feb 15, 2024 · For example, I went from a catted downpipe with cat back exhaust on my GTI to a catless resonated downpipe with the stock exhaust. Aug 3, 2020 · Hey guys I am wondering how catted downpipes sound on the M5. co Anyone have suggestions on doing catted downpipes vs catless - I was told on this forum there are some issues doing catless with o2 sensors etc and obvious emissions. 5″ G20/G22/G26 B58 Stainless Steel Downpipe Made with full 304 Stainless Steel and 3" construction these downpipes provide a significant increase in power and torque over the OEM catted downpipes. It also causes turbulence after the catalytic converter which causes the exhaust flow to slow down (which increases restriction). Stock downpipes are built for compromise. Discover performance benefits and sound changes. VRSF Downpipe - Catted vs Catless. Catless downpipes are an off road only modification and should not be used on the street. The active autowerke downpipes use EPA-approved GESI cats; you are much more likely to pass emissions with these downpipes. Aug 9, 2006 · What is the HP lose for a catted downpipe vs a catless downpipe. It's also one of the most tested downpipes available, with hundreds currently Nov 5, 2023 · Sound clip differences between catless and catted downpipes. Similar to it's brother the N55, the N20 has a stock downpipe with a catalyst that drastically restricts exhaust flow. ApexBuilt G8X HFC downpipes offer perfect fitment, drastically improved throttle response & exhaust note vs OEM, and a lifetime warranty. BUSINESS HOURS 7am-5pm Pacific Time Went with catless on my F10 535i Unfortunately if you daily the car the smell is quite unpleasant (feels like/worse than a diesel). Anyone is welcome! Members Online. If performance is your concern/goal I think there’s negligible difference between most, some say even Catted vs catless. Catless (Help with choice & real world comparison)? The Mad Catless B58 Downpipe is an essential upgrade for any BMW enthusiast looking to maximize the performance of their B58 engine. So I sold it and bought catted one. By eliminating the restrictive catalytic converter in the factory downpipe, back pressure is significantly reduced which results in faster spool, an increase in power & a more aggressive exhaust note. yes you can run a catless down pipe with a catless exhaust system or any combo of a catted or non catted down pipe or exhaust. Very excited to say the least. 5" vs 5" catless downpipe Google Search Search Forums Jul 7, 2022 · You can change the secondary downpipes, no check engine light. Catted vs. Catless Options Guest-only advertisement. Sep 23, 2022 · Out now: Our all-new high flow catted downpipes for the 2021+ BMW G8X M3 & M4. N54 downpipe mods are really only intended for off-road use. 93 out of 5 based on 14 customer ratings We are proud to introduce our VRSF Race Down Pipe for your N20 & N26 BMW. Understanding Downpipes and Fuel Consumption Apr 2, 2020 · When your turbo dumps a bunch of air into the downpipe, but the downpipe is restrictive, the air bounces back from the downpipe to the turbo. I think what you're worried about is an exhaust leak, and exhaust leaks typically sound more like a hissing. I'm torn between a few options: MAD Catted Downpipe (around $400), Catless Downpipe (around $250-300), and Active Autowerke Catted Downpipe (around $1,500). the only pro for catless over high flow catted is the cheaper cost. These downpipes are THE best bang for the buck mod available for your B58 and they’re available in both race & high flow configurations. I'd like to retain the MPE note as it's perfect. Suitable for BMW/Toyota B58 3. Real-World Variability: Actual fuel consumption changes can vary widely based on individual driving conditions and vehicle modifications. 1. I'm really looking to hear from people who have purchased the VRSF catted downpipe to provide an up-to-date review on the exhaust note, drone, smell increase, etc. Having either your primary or secondary cats should heavily reduce the smell. Catless down pipe and emission help! BMW 3-Series and 4-Series Forum (F30 / F32) | F30POST > Technical Forums > N20, N26, B46, B48 Turbo Engine / Drivetrain / Exhaust Modifications > Bmw b48 downpipe choices Google Search Search Forums Now. the only exception to this is the active autowerke downpipe as they use GESI cats which do not trigger a check engine light _____ traditionally the catless downpipe made more power than the catted downpipe due to the cat material slowing down the air flow. So you are just going with new turbo then aka diverter was good? I'm not sure how much bigger that turbo is, but You idle your car a lot and Id hate for you to have exhaust smell that bad all the time, at least catted allows SOME control. Do not compromise performance and sound with factory parts – unleash your BMW’s potential! Designed using the latest in CAD technology; this part is made to fit perfectly in place of your factory downpipe. The most popular N54 and N55 downpipes do not have mounting brackets and there are even less mounting points for the catback whereas the B58 has Feb 6, 2015 · BMW 3-Series and 4-Series Forum (F30 / F32) | F30POST > Technical Forums > N20, N26, B46, B48 Turbo Engine / Drivetrain / Exhaust Modifications > Downpipe catless vs catted help Google Search Search Forums I have catless downpipes and an AWE full exhaust. Stick to catted downpipes with the 4" catalyst vs those bragging 5" on a 4" downpipe. 2011 – 2012 E82/E88 BMW 1M N54. BMW Garage: BMW Meets: Register: Today's Posts: Like many of you, I thought a LOT about catless vs catted downpipes. They balance performance, noise, and emissions. I think you can spend 3k on much more Catless downpipes are one of the best mods for performance you can do to your N54. 2012-2015 BMW 3-Series and 4-Series Forum. The catted downpipe is an APR and the Catless is ARM. Catted downpipes provide slightly less horsepower (about 5-10 lesser) but they have much more pros than the catless version: significantly less emission, no unpleasant smell, and has lesser chances of Nov 29, 2021 · Catless downpipes with a tune usually net about 20-30 whp and 30-50 wtq. S63 catless vs high-flow catted downpipes. Sep 12, 2024 · Among the best bolt-on upgrades are a set of catless or high-flow catted downpipes. Should work the same vise versa. Catless Downpipes. Note: The catted version is limited to LHD fitments. Catless downpipes might be more susceptible to heat and exhaust gas damage. Jul 13, 2023 · Best Catted Downpipe F30POST > 2012-2019 BMW 3 and 4-Series Forums > General F30 I don't want to go catless but what other high-flow downpipes should I look Exhaust comparison between a Catless Downpipe from VRSF and a Catted Downpipe with a high flow cat from Evolution Racewerks. For those who want performance improvements without sacrificing emissions compliance, a catted downpipe is a great alternative. Also, ha Alternatives to Catless Downpipes Catted Downpipes. Stock vs. The 5" versions will give the CEL, and sound horrible (boomy raspy sound). is it worth it to get a catted down pipe i can't deside which one to buy to run stage 2 in this thread in this sub-forum in the entire site Welcome to our exhaust sound demonstration! In this video, we show off our 2023 BMW M340i by comparing the stock exhaust system to the upgraded Active Autowe The downpipe carries exhaust gas from the hot side of your turbo to the rest of the exhaust system. We are proud to introduce our VRSF race & high flow catted downpipe for your B58 M240i, 340i, 440i, 540i, 740i & xDrive variants. 01-05-2022 10:12 PM #2. Learn how these components impact your vehicle's performance and emissions. VRSF offers both catless and catted versions of their N55 downpipe. However, catless downpipes do have a significant pitfall for some. burbletune. Aftermarket Downpipes. High Flow Catted Vs Catless Yea, there's also a lot that goes into sound differences. Is the smell actually bad? If so, I will have to go with the catted then Mar 27, 2024 · Choice between catless and catted downpipe. By eliminating the restrictive catalytic converter in the factory downpipe, back pressure is reduced significantly which results in faster spool, an increase in power & a more aggressive exhaust note. There is still some smell, but significantly better compared to catless setup. An N20 downpipe This is one of the highest-efficiency downpipes worldwide. The volume is slightly lower but the tone is higher and a tad raspy. Most catted downpipes come with a “high flow sports cat”, which are less restrictive catalytic converters that allow for improved performance while still passing emission tests. Picking up a car with MPE installed. Going catless over the stock downpipes can yield gains of 25+ horsepower. Catted or Catless Downpipes: Pros and Cons. Smooth radius bends decrease turbulence and increase flow. VRSF Catted Downpipes for 2019 – 2022 BMW X3M & X4M S58 F97 F98 VRSF Racing Downpipes S58 2020 – 2023 BMW M3 & M4 G80, G82, G83 – 10802058. Make an informed choice for your next upgrade. Manufactured from T304 stainless Read More "CTS Turbo 4. Any chime in on their experience with catted downpipes ? Cheers Yes I have looked around but doesn't seem like anyone does catted. In this guide, we discuss S58 downpipe upgrades including power gains, sound, catless vs high-flow, and more. BMW S63tu upgaded DP's performance, hp, and sound. This makes them a more environmentally responsible choice and ensures compliance with emissions testing in many The BMW N54 market is clear proof that the bracket is simply another over engineered inclusion from BMW in order to make it easier for techs to align the downpipe with the turbo and catback. Features* Largest diameter downpipe for B58 wor Sep 10, 2023 · High-flow catted downpipes – 200 cell high flow cats; Catted downpipes – series of standalone catalytic converters; Let’s compare the pros and cons of each design: Catless Downpipes. If you live in a place where emissions testing is required Apr 27, 2024 · Catted (high flow): Good ones won't trigger the CEL, and have marginally less performance than catless. BMW 335/135 Catted Downpipes (High-Flow) ((RHD Model)- The price is on the higher side at $950. . com. You can see light coming through at a certain angle. Sep 6, 2021 · cts or arm catted downpipe vs stock Hey guys, i'm looking to upgrade my stock dp to some highflow catted dp for better exhaust sound and slightly better power, and not really interested in paying $1500-3000 for dp. Is anyone running a VRSF Catted downpipe on their 540i? Wanna get downpipes for my m4, I know most people say just to go with the cheapest one just wondering if PLM is a trustable/good quality downpipe brand for the m4 f82, It's insanely cheap I found a seller on facebook for like $275 whereas vrsf is $479, I just want something that gives that release of pressure to the engine with decat, hence more horsepower, and increased sound. You won't have to worry about fuel smells or check engine light issues; that's a guarantee. Catless is louder than both but also raspy and generates a fuel smell. See full list on bmwtuning. High HP and torque gains. I'm running catless downpipes with stock catted midpipe and I only get a gas smell when I'm idling in my garage. It was $1400 for just the pipe Jun 3, 2023 · The Active Autowerke downpipe is the top-tier choice for catted downpipes. TikTok video from whychriis (@whychriis): “Explore the differences between catted and catless downpipes for BMW 440i. Bimmerpost ☰ Model Selection. There's a ton of conflicting info on the web regarding catless vs catted DP's especially for novices like me but your rational makes a lot of sense. A catted downpipe retains the catalytic converter but features a more efficient, high-flow design. Because catted downpipes contain a catalytic converter, they significantly reduce harmful pollutants. I would like to get catless but I'm worried about the smell so I am thinking about doing catted. Customization: Catted downpipes offer customization options with various catalytic converter types and sizes. From: $ 569. Appreciate 0 the exhaust system starts after the turbine wheel, so your downpipe is the first piece (arguably it includes the headers & turbine, but we'll just call that part of the forced induction system) of the exhaust, then the cats, then the piping. F40Model Year: 2019 + THE LARGEST BMW 2-SERIES FORUM ON THE PLANET. B58 Catless vs. 5″ Race Downpipe for BMW B58 1 I have a race catted Downpipe from active autowerke that was advertised CEL free guaranteed. Jun 18, 2024 · I'm looking to upgrade my BMW G20 M340i with a new downpipe and pair it with a muffler delete to enhance performance and sound. 99 + VRSF Racing Downpipes for V8 N63R 2017 – 2021 BMW M550i, 750i, 850i, X5 M50i, X6 . Jun 30, 2020 · In this guide, we will compare N63 catless and catted downpipes, lay out the pros and cons of each, and list a few of the best N63 upgraded downpipes. Made from high-quality materials, this downpipe is designed to provide maximum exhaust flow and improve turbo spool time, resulting in increased horsepower and torque. Feb 1, 2023 · I’ve been recently looking for a high flow catted downpipe so that I could take my g20 330i to stage 2. May 12, 2021 · Both catless and high-flow catted downpipes are generally illegal. VRSF 4. Mar 4, 2021 · BMW M5 Catless vs Catted DP’s. In these videos I have Feb 25, 2016 · BMW 3-Series and 4-Series Forum (F30 / F32) | F30POST > Technical Forums > B58 Turbo Engine / Drivetrain / Exhaust Modifications > B58 BMW 340 VM 4" CátLess D0wnpipe Dyno Testing - Before and After Results No cats equals more power faster because of less exhaust restrictions. BMW S55 Upgraded Downpipe Options Let’s move on to a few of the popular, quality S55 downpipe options. Feb 19, 2025 · The VRSF 3. Made from mandrel bent, tig welded 304 grade stainless steel. Only worry is I have an e93 (convertible) and worried that it might be a very strong smell if I have catless downpipes n the roof is dropped. My personal recommendation is to go for catted high-flow downpipe. BMW Garage: BMW Meets: 833 Likes, 38 Comments. However, this post is primarily focused on catless options as they offer the best bang for the buck. Not all downpipes are created equal. Past: FBO 2015 BMW M4, 2010 Audi S5, 2019 X4 M40i. If you change the primary downpipe to catless or catted, it will trigger the check engine light. 00; Note: Some of these downpipes are available in both catless and catted versions. If you look into the stock downpipe, you can't even see light come through the other side. Ask technical questions, contribute answers, or show off your ride. Do not compromise performance and sound with factory parts – unleash your BMW’s potential! Designed using the latest in CAD technology; this part is made to fit perfectly in place of your Read More "CTS Turbo BMW F2X/F3X/G20/G30 230i/330i/430i/530i & xDrive Note: While we do offer a lifetime warranty on the downpipes, we only offer a 1 year warranty on the ceramic coating and high flow cat. Oct 8, 2023 · I’ve got MAD catted downpipes and love them personally Paired with their single midpipe and it sounds great. I Feb 20, 2025 · The durability of catted and catless downpipes can vary. Aftermarket BMW B48 Downpipe Catless or High Flow Catted will improve flow and performance. Pros: Maximum flow capability and power gains; Aggressive exhaust tone when combined with other mods; Cons: Not legal/compliant in many areas due to no cats Jan 5, 2022 · Sport Cat Downpipes vs. The tuner said doing catless wont sound good. High-flow catted downpipes may pass emissions in some states, but tampering with OE emissions equipment may still be illegal. High Flow Downpipes Jul 5, 2020 · Learn about BMW S63 upgraded downpipes (DP's). Car: 2011 E90 335i X-drive AT New to BMW, have been a 15' GTI guy for a while. Took about a week to I am looking to get a downpipe for my F30 335i N55 engine. I've had a few of my friends tell me to get a downpipe, specifically a catless VRSF dp for louder sound (unrestricted) and better performance. com/TURBOSPOOLE85/I wanted to answer the question if there is in fact a difference in power between a high-flow cat downpipe, and a cat Oct 13, 2024 · Types of Downpipes for BMW M4. If any have any CEL issues, AA replaces the downpipe asap. Sep 17, 2023 · There is no power difference on stock cars between catless and high-flow catted. Catted: Keep the catalytic converter Sep 21, 2022 · I would opt for high flow catted vs catless. Catless: The choice between a catted and catless downpipe can influence fuel consumption, but the difference is often minimal. The catalyst is like a sponge that absorbs a lot of that higher pitched rasp, a resonator is a straight through piece of pipe with some Catted downpipes and catless downpipes. Catted systems may be more durable due to the protective nature of the catalytic converter. All VRSF downpipes are hand crafted from SS304 grade stainless steel and include a lifetime warranty as well as our “No Hassle” satisfaction guarantee (includes fitment). “No Hassle” satisfaction guarantee. Catted downpipes incorporate a catalytic converter, making them the road-legal option. the power gains from nonOEM exhaust systems come from reduced backpressure - the engine no longer has to Description. For more information about the BMW N63 engine including engine specs, common problems, and popular modifications, take a look at our dedicated BMW N63 Engine Page . It uses GESI cats, which are EPA approved. Are you still in confusion as to what downpipe to go for? We are proud to introduce our VRSF race & high flow catted downpipe for your B58 M240i, 340i, 440i, 540i, 740i & xDrive variants. 0 engine vehicles. Overall length of exhaust, turbo sizing, muffler design, etc. 2014 BMW 650xi Gran Coupe Msport Black Sapphire Metallic BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > Catted Downpipes vs. This downpipe is THE best bang for the buck mod available. LOUD AF with valves open Raspy S55 noises Smelly Zero restriction = fast Check engine light Won’t pass emissions I am going to swap out to high flow, resonated catted downpipes to reduce stank and be a bit more environmentally friendly, and go for a single midpipe. So it’s definitely possible. 99 + BMW 3-Series and 4-Series Forum (F30 / F32) | F30POST > Technical Forums > N20, N26, B46, B48 Turbo Engine / Drivetrain / Exhaust Modifications > Catted vs Catless Google Search Search Forums The ARM Motorsports N20 Downpipe is the best hardware upgrade to get the most power from your 320i or 328i. Again, easy to spend your money but something like this. instagram. Jun 29, 2020 · N20 Catless Downpipe vs High-Flow Catted Downpipe Catless downpipe options for the N20 are the least restrictive, and will result in the best power gains and spool. Replace a faulty catted downpipe with an OEM downpipe or upgrade for more performance with our selection of aftermarket performance downpipe options. VRSF BMW X4 M40i & M40iX N55 Stainless Steel Down Pipe Upgrade. VRSF Catted Downpipes for 2019 – 2022 BMW X3M & X4M S58 F97 F98 $ 599. My understanding is that if you do run catless down pipes you need a o2 simulator to take care of the check engine light. An aftermarket catted dp uses a high flow cat with fewer, wider cells. The standard catted downpipe is unlikely to pass emission in most states since they trigger the check engine light. ojle delxmx feuzrdp penkn ymhn srncy xphkl uity mmdt knpdve vbowi svtgqymc wyaxm eaeurp uxq