i currently have a apexi GT Spec cat back exhaust system on my 05 wrx, i was wondering what up pipe and down pipe combo would work well with my turbo and the exhaust as well as something that would fit well.

 

It doesnt really matter which downpipe and uppipe you use as long as the version is usdm and not jdm. If you get a jdm up and down it will not bolt up correctly. You can even get different brands. I would suggest picking something up like a helix or turbo xs up and down.. Any way good luck heres a link to a store that supplies the helix. www.gruppe-s.com Oh ya also i suggest to stay away from the hks downpipe it is reallly poor quality and many people have needed to replace them prematurely.