ARM 4.5" Downpipe || B58
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ARM 4.5" Downpipe || B58

$297.00
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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, improves turbo spool, allows you to safely run stage 2+ tuning, all while increasing the sound of your B58-powered BMW.    ENHANCE THE SOUND OF YOUR B58 The ARM B58 Downpipe will increase the overall volume of your BMW, open up the exhaust burbles even on OEM programming, and make the turbo spool significantly more audible.  The M240i in the video below is only equipped with the ARM B58 Downpipe, it is otherwise on a 100% stock exhaust. The car has never been flashed, it is on the original DME programming from BMW.   CONSTRUCTION The ARM B58 Downpipe is built with SS304 stainless steel and backed by the ARM Motorsports Lifetime Warranty.  The ARM

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