I tried doing searches... but I would like to know the pipe size for the Apexi WS, I want to do the warpspeed Y and cat combo with a cat back, I would like to know what exhausts come in 2.5" other than Greddy SP and EVO, thank you

 

Greddy SP or Stillen...that is it!
For us 4th Gen folks, the ONLY choice for a 2.5" cat-back is Greddy SP. Warpspeed & Cattman, both have a 2.5" cat-back in the works. Warpspeed should also have a 2.75" and a 3.00" option, soon.
Check out this thread for details:

 

why would Apexi make a 2 1/4" catback system?
Im pretty sure its 2.5"

Ant

 

2.25" cat back piping...2.5" muffler section.

 

Apexi is 2 1/8". I just measured it. Some parts are 2 1/2" but most of it was 2 1/8".

 

well I guess im going with greddy then, I am not to hip on the idea of a universal muffler peiced together and ive always liked the greddy. thanx guys

 

That sucks