Originally Posted by Wes.
Probably nothing measurable. Though it should sound a lot better. Supras and R32-R34 GTRs sound amazing because of the big single exhaust on the I6.
'09 E93 M3 6MT, ESS VT2-650, UUC/Corsa, MS X-pipe, H&R sports, Volk TE37SL 18x9.5+22f and 18x11+34r, Spec TwinDisc P-trim, UCP
'09 Z4 sDrive35i DCT, JB4, DCI