Alright well I've been reading up on most of the Cat Back systems available and came to the conclusion that the Greddy System is pretty much what I'm looking for. I called my exhaust shop that did a full custom system for my truck and asked them how much it would cost to do a complete dual system for my car. They quoted me around the same price as it would cost to buy the Greddy Evo2's. Is there a performance difference between full custom Dual vs. Cat Back. Also what would be the sound difference if I put on two greddy mufflers with a custom dual vs. the greddy evo2 cat back?