sorry soop i don't buy it. if i'm gonna spend some serious coin on a exhaust system i would expect some improvement other then a better exhaust note
It is an improvement. Combined with other mods like anything else. It doesnt make .2sec difference over the 1/4 by its self though. Its still a standard motor.
Problem is, everyone thinks they can spend two bob on parts and have a missle. Doesn't work like that.
I run a 13.8 (couple years ago now) with some HM shorties and a heap of crap Xforce exhaust. The Xforce exhaust probably flowed about as well as a the standard system...
I agree ashbox.
But the tune does effect the basic opperation of the motor, so its going to make the engine perform differently. If only a little more efficiently.