exhaust pipe diameter

[Cake]

I'm researching for an exhaust for my R33 GTS25t. At the moment the exhaust is stock, except for a high flow cat which was fitted at compliance. What's the best piping size for the RB25DET? some say 3", others anywhere up to 4"? Most power my car will ever be pumping out is ~ 300rwhp. Also if i get a catback exhaust first, that's say 90mm, is it best to try get the rest of the exhaust the same size?

p.s.:anyone know anywhere that has any apexi dual n1 catbacks left over in stock?

[GTS-t VSPEC]

Boost,

I wouldn't bother with more than 3", it is just an added expense and for 300rwhp then you won't see any performance benefit from 4". It is always worth trying to keep the exhaust diameter constant, the less diameter changes the better the flow.

See'ya:burnout:

[Xeron]

With too large a diamater exhaust the gasses loose velocity, this is not a cool thing. Go with 3".

[JH32]

Boosty make sure you get turbo back :)

Hey get a dyno of before and after too for extra fun

[APA]

sub zero have dual muffler and piping exhausts for gts-t's

they in queensland or wat ever though!

adrian