The MAD 3.5" S58 Fat boy is the largest BMW S58 catless downpipe on the market!
Upgrade from the stock S58 downpipes to the MAD 3.5" Fat Boy S58 catless downpipes for maximum airflow, power, and sound!
Upgrade to the MAD BMW 3.5" Fat Boy S58 downpipes to eliminate the back pressure caused by your stock catalytic converters. By upgrading to our downpipes, your turbos can now spool faster and achieve maximum power. As a bonus, your car will sound a lot nicer as well.
Expect up to a 30HP increase on a tuned BMW S58 with stock turbos, even more on cars with upgraded turbos.
The flex pipe Section will help reduce the stress and unwanted vibration from the downpipes.
Features:
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Largest 3.5'' Diameter piping compared to standard 3''
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Compatible with right-hand drive and left-hand drive vehicles
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Smooth bends for maximum airflow without any drone
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Up to 30 HP increase on the stock turbos, even more on upgraded turbos
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Lifetime warranty on defects and fitment
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All orders ship in 1-2 business days
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Spot on fitment
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Flex section
Fitment:
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2021+ BMW M3 G80
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2021+ BMW M4 G82 G83
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2023+ BMW M2 G87
NOTE: Downpipe gasket is not included. Part # 18308053348 qty 2 is required for installation.
Emissions Disclaimer:
This product is not legal for sale or use on pollution-controlled vehicles operated on public roads, highways, or streets. It is intended for off-road, race, or closed-course competition use only, where such modifications are permitted.
By purchasing this product, you acknowledge and agree that:
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You are responsible for compliance with all applicable emissions laws and regulations.
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MAD and its affiliates disclaim any liability for improper or unlawful use of this product.
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Use of this part on public roads may violate the Federal Clean Air Act (42 U.S.C. § 7522) and similar state laws.
Please check your local laws before purchase and installation.
