Thanks for that. So how much improvement in horsepower could I expect to see - at the wheels - from a Milltek catback?
Edit - with uprev, I mean.
Hello. Hard to say. Bigger diameter and smoother with the Y pipes or true twin is always going to be better. I haven't had the chance to have one car on the dyno and do a full set of back to back tests unlike what Mark at Abbey has managed plus you can even see 2 cars, same year, same motor same mods making 15bhp difference so again hard to say. Its a case of better breathing is always going to see bigger improvements in overall performance and throttle response. Sorry I couldn't be more specific.