S63 F10/F12 M5 & M6 which feature a CNC stainless steel v-band to pipe transition. These 3″ downpipes are the best bang for the buck mod available for your S63, with gains from 50hp & 60tq when tuned. By eliminating the restrictive catalytic converters in the factory downpipes, backpressure is reduced significantly which results in faster spool, an increase in power & a more aggressive exhaust note.