1996 GT auto......FRPP shortys,Bassani catted x,& Flowmaster 40 series,welded in,but soon to have a catback. Unsure about what brand i want yet,or if im just gonna get new 2 1/2 inch piping welded in since i already bought the flowmaster mufflers.The local shop said they would do it with 3 inch stainless tips for $320. Any suggestions