ARM B58 Catless Downpipe 4.5" (Fits 240I 340I 440I 540I 640I 740I M340i) Billet caps Item Weight: 200g

Item Weight: 200g

Ethanol Sensor

Simple installation

and center mesh grille

xDrive models

ARM B58 Catless Downpipe 4.5" (Fits 240I 340I 440I 540I 640I 740I M340i) Billet caps Item Weight: 200gHIGHLIGHTS Increase Power and Torque Faster Turbo Spool Improved Exhaust Sound Safely Flash Stage 2+ Tunes SS304 Stainless Steel PROFILE The ARM B58 Downpipe is one of the foundational upgrades for giving your B58 powered BMW more power, torque, and sound. The stock B58 downpipe comes from the factory with a catalyst that severely restricts exhaust flow, causing excessive backpressure with increased boost. Upgrading your downpipe unlocks power,