BMW B58 TURBO BACK EXHAUST SYSTEM - M240i/340i/440i
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BMW B58 TURBO BACK EXHAUST SYSTEM - M240i/340i/440i

$997.00
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30 Day Money-Back Guarantee | IN STOCK B58 DOWNPIPES The ARM B58 Downpipe is one of the foundational upgrades for giving your B58-powered BMW more power, torque, and sound.  We offer THREE different versions of the B58 downpipe. Those versions include, 4.5in Downpipe, 6in Downpipe, and 6in Catted Downpipe. 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, improves turbo spool, allows you to safely run stage 2+ tuning, all while increasing the sound of your B58-powered BMW.  B58 MIDPIPE UPGRADE The ARM M240i/340i/440i Midpipe significantly improves the sound of your B58, giving it the aggressive exhaust note you're looking for from a tuned B58-powered BMW. Designed to amplify the power and sound of your B58, the ARM M240i/340i/440i Midpipe eliminates the two central resonators found in the stock M240i/340i/440i midpi

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