VRSF Downpipe Upgrade for 2015 – 2018 BMW X4 M40i & M40iX N55 F26 (Racing Downpipes)VRSF Downpipe Upgrade BMW X4 M40i & M40iX N55 F26 (2015 2018) The factory downpipe on the X4 M40i is the single best bolt on upgrade available. By eliminating the restrictive catalytic converter and reducing back pressure, the VRSF Race Downpipe delivers faster spool, 20 25 horsepower gains with a tune, and a more aggressive exhaust note. Available in race (catless) configuration or with a 200 cell high flow sport cat. Mandrel bent SS304 stainless
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VRSF Downpipe Upgrade for 2015 – 2018 BMW X4 M40i & M40iX N55 F26 (Racing Downpipes)