I sourced this cheap for my V1 which has side entry rather than the restrictive Y-pipe affair.
Still playing with it and going to take a few months till i'm done tinkering with it, but first impressions are that it's a good upgrade for V1/2:-
http://www.type-ra.com/subaru-forum/...002-jpg.26544/
I'm doing a project thread on another forum and will repeat it on SES once i'm done tinkering and working things out. will make it a more tidy thread on here doing it this way.