Originally posted by Tom
n00b! 
its pretty noticeable, it also gives a boost in hp, (in my case about 15hp jump) and it starts after 5800rpm to 8300rpm and you can feel it driving/riding in the car
i hope i helped!
U got a dyno to prove that? ( that 15 HP JUMP) From any RSX for that matter.
Last time I checked the main purpose was to allow for a smoother delivers throughout the powerband, with a more efficient high end.
I could be on cloud nine though, since I drive a skittle now.
Never mind I found one:
http://www.comptechusa.com/images/dyno/rsx-catback.pdf
Thats with a comptech exhaust system on a Type S.