Originally Posted by niqui
nice, but i would assume the gains decrease significantly if the car already has a highflow exhaust?
You are absolutely correct. We tested the intake system with a full Akrapovic system on M3poster Donbona's M3 and it made an additional 5 BHP. I will post up to dyno graphs shortly.
Edited to add: Donbona's car already had a BMC drop in filter.