As above really, is there much difference between the two headers and up pipe?
I ask as I have an 04 STi engine which I have fitted a set of wrx headers too, will I be compromising the performance?
Cheers in advance :-)
Ian.

 

The headers are the same but the up-pipe of the wrx had a cat in it, So if that is still there then i would say yes you are a bit, Get an sti up-pipe put on it,

Gaz.

 

No cat in my up pipe so must of been replaced at some point.
Thanks for reply