BTB is the only system to have proven gains.
incorrect on 2 accounts. As Dubai has said, supersprint have proven gains... and my car was put on the rollers before and after when developing the new K-Tec exhaust, showing a 3bhp gain with the standard CAT.
you should really be more careful with your statements... you just make yourself and Shed Motorsport look silly.
where are the graphs then, i have only seen the btb graph ???