VRSF 3" Cast Stainless Steel Catless Downpipes 15-19 BMW M3 & M4 & M2 Competition S55 F80/F82/F87We are proud to introduce the VRSF 3" Catless Downpipes for the S55 F80 F82 M3 & M4 which are one of the only downpipes to feature a cast stainless steel v band to pipe transition. These 3" downpipes are the best bang for the buck mod available for your S55, with gains from 25hp & 30tq when tuned. By eliminating the restrictive catalytic converters in the factory downpipes, backpressure is reduced significantly which results in faster spool, an