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That H pipeadaptor will not work because it's just that, an adaptor for GT take offs, not intended for regular exhaust. Maybe a shop could find a way to fab it in, but as it sits, it will not bolt up.
hey sabin, this past winter i had a shop install jba shortie headers which are great but from there they installed the slp high-flow cat x-pipe for the gt and the slp loudmouth 1 exhaust system. it sounds great. now the mufflers are more like resonators so its alot louder at high rpms. the only complication was the flanges from the x-pipe to the headers dont match up so the shop custom fabricated them to fit. the slp setup i bought is from americanmuscle.com