BMW M340i Exhaust: Axle-Back vs Cat-Back Comparison
Explore the differences between axle-back and cat-back BMW M340i exhaust systems, focusing on sound, drone, and daily usability for your vehicle.
By Lee Shahin ·
BMW M3 downpipes
7 downpipes for the G80 BMW M3 (S58 3.0L twin-turbo inline-six) from 5 brands. The downpipe joins the turbocharger outlet to the rest of the exhaust. Aftermarket versions are sold with a high-flow catalytic converter or without one.
Before you order
- Removing or replacing a catalytic converter with a part that is not certified for the vehicle is illegal for road use under the federal Clean Air Act. Catless parts are sold for off-road use only.
- In California and other CARB states a replacement converter needs an Executive Order number for the specific vehicle.
- Check the retailer listing for whether engine software changes are required.
- Listings are read from the retailer's G80 M3 (S58 3.0L) category. Competition, xDrive and Touring (G81) cars can use different parts. Confirm model, drivetrain and model year on the retailer page before ordering.
Brands on this page: Active Autowerke (2), MAD (2), ARM Motorsports (1), Akrapovic (1), Valvetronic Designs (1).
ARM Motorsports · Part no. S58DPC
ARM Catted Downpipes - G80/G82/G83 S58
200 Cell Catted Downpipe
Active Autowerke · Part no. 11-085A
BMW S58 G80 M3 G82 M4 G87 M2 Downpipes W Aflow CATs
EPA compliant cat with increased flow and performance!
Active Autowerke · Part no. 11-085
S58 Downpipe With Gesi Cat
Epa compliant cat with increased flow and performance!
Akrapovic · Part no. DP-BM/SS/8
Akrapovic Downpipe With Cat - G80/G82 M3/M4
A sporty 300 cpsi catalytic converter is integrated into the downpipe
MAD · Part no. MAD-051
MAD BMW S58 Catted Downpipes M2 M3 M4 G87 G80 G82 G83 W/ Flex Section
Don't settle for stock performance - upgrade to the Mad S58 200 Cell Race Catted Downpipes and experience the true potential of your BMW.
MAD · Part no. MAD-2051
MAD S58 Catted Downpipes G80/82/83 With Flex Section
Reduces backpressure from stock catalytic converters and can produce a 30hp gain.
Valvetronic Designs · Part no. G8XFF400CBR
400 Cell Catted Downpipes
Elevate the performance and acoustic profile of your BMW G8X with Valvetronic Designs' EPA-compliant 400-cell catted downpipes.
Guides for this decision
More BMW M3 parts
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- BMW M3 turbochargers & turbo parts
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