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.
'08 E90 335i 6MT. Under construction for a 'few good mods'
'09 E93 M3 6MT, H&R sports, Spec TwinDisc P-trim, UCP, FOR SALE
'09 Z4 sDrive35i DCT, MHD Backend flash, JB4, DCI