6 Inch B58 Downpipe for Supra 3.0T & BMW M240i, M340i, 340i, 440i, M440i, 540i, 640i, 740i, 840i, X5, Z4 Select one:Catless If you're running E85 or

If you're running E85 or ethanol mixes in your VR30DDTT powered Infiniti

ensuring long-lasting performance under any condition

4L Hybrid Gas

Elevate the performance of your 2011-2016 Ford F250 or F350 Powerstroke 6

it provides noticeable improvements in both power and efficiency

6 Inch B58 Downpipe for Supra 3.0T & BMW M240i, M340i, 340i, 440i, M440i, 540i, 640i, 740i, 840i, X5, Z4 Select one:Catless If you're running E85 orThe ARM 6" 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 to the ARM 6" B58 Downpipe unlocks power, improves turbo spool, allows you to safely run stage 2+ tuning, all while improving the sound of your B58 powered BMW. The ARM