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, H&R sports, 15/12.5 TMS spacers, VF540 kit awaiting install and Evolve tune file
'09 Z4 sDrive35i, Deep Sea Blue Metallic, DCT, Premium Pkg, Ivory Leather pkg