I didn't have a chance to get before/after tests done. I wanted to, but it didn't work out that way with my work schedule. Actually the best way to do it would be to get the base line, change out exhaust same day and them get the after run. I know that all our cars are different, but hopefully these results are good enough to show everyone until i get to the dyno on monday for another pull.
2013 Bmw M5-Alpine White/Black-Oem gloss blk powder coated wheels-Expel clear bra-35% tint-Rpi Gtm Exhaust Hr springs 562hp/524tq