I used Flowmaster Hushpowers on my 5 window. Smaller diameter and great sound. Makes the fit easier in a So-Cal chassis, with the ladder bars and all. Went over the rear end as well. Since the entire exhaust is Jet Hot coated I also used exhaust insulators from summit over the rear end, All silver with stainless clamps, looks great. Also insulated with sound deadener and normal insulation.