VRSF Race Downpipe BMW X4 M40i N55 F26 15-18VRSF Race Downpipe BMW X4 M40i 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. Mandrel bent SS304 stainless steel with precision CNC machined flanges for a guaranteed leak free fit. Also available with a
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