ARM B58 Catless Downpipe 4.5" (Fits 240I 340I 440I 540I 640I 740I M340i) N54 -2x2 Carbon fiber weave

-2x2 Carbon fiber weave

S55 BMW ApplicationsBMW M2 • 2018+ M2 Competition (S55 Engine)BMW M3 • 2015-2019 F80 M3BMW M4• 2015+ F82 F83 M4

The ARM N54 Charge Pipe has an integrated blow-off valve flange designed for the 50mm TiAL Q BOV (BOV sold separately)

these fangs enhance airflow around the front end

Attention: Be sure to select the correct intake when ordering

ARM B58 Catless Downpipe 4.5" (Fits 240I 340I 440I 540I 640I 740I M340i) N54 -2x2 Carbon fiber weaveHIGHLIGHTS 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,