I have a greddy kit and right now i have the apex world sport 2.36 i was thinking of upgrading to 2.5inch but is it really worth it or should i go to 3 alos around how much power difrence am i looking at cause im still trying to keep this exhaust quite.

 

I you are planning on going turbo get a 3" exhaust. It isnt that big of a deal when you arent running that much hp but eventually you will want a 3" to get that extra power with a turbo.

 

Chaz, Greddy also makes an Evo system for cars taht have aftermarket turbos. They are 70mm or about 2.75"

http://www.greddy.com/prod_evott.htm

I have an Apexi Dunk system for a GSR coupe if you want something a little better flowing than the WS.

 

what size piping is it ?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by tegon-gsr &raquo;</TD></TR><TR><TD CLASS="quote">what size piping is it ?</TD></TR></TABLE>

2.5"