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then just buy the b&b catback.i have it and for making hp,IT SUCKS.the quality is good and it's mellow sounding,but on my ws.6 ta it only made 3hp. goodluck to ya.
Just keep an eye out in the classifieds you might get lucky.
I got lucky and got a pair. They are the best looking exhaust tips along with Corsa IMO
good luck