just talked to brian, he said i could spill the beans. my "custom 3" exhaust, was a urd prototype. its freaking bitchen. the welds are perfect, the muffler sounds great, its 3" and best of all.............upsized y pipe with no cats! the trucks sounds mean now. i cant contest with the NA guys, but there was def performance to be had with the sc 4.0. no doubt this is the highest quality catback ive seen for a long time......ill get pics up soon as i can. :headbang::headbang:go urd:waytogo: