Hi All. Has anybody used the gn1performance 3 inch stainless exhaust system with the mufflers??? I wanted it without the mufflers, but he won't sell it that way. Does it fit O.K.? Does it perform O.K.? Are there better mufflers out there, if so which ones? Also, I need to run a 3 inch test pipe if I go this big, correct? A bigger down pipe??? Any feedback is great.