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you may want to upgrade the 4 bolt interface to a 6 bolt interface
Viton o-ring seals
Race tested and approved
Because of this the DI system in the car is required to constantly make corrections to keep target AFR in check
VRSF 3.5" Cast Stainless Steel Downpipe | F25 X3 35i · F26 X4 35i Finish:Brushed you may want to upgradeWe are proud to introduce our VRSF 3. 5 downpipe for your N55 F25 F26 BMW X3 & X4. This direct bolt on downpipe is THE best bang for the buck mod available for your BMW. By eliminating the restrictive catalytic converter in the factory downpipe, back pressure is reduced significantly which results in faster spool, an increase in power & a more aggressive exhaust note. We also offer a catted version of this downpipe which features a 200 cell high flow
