I have put on TTI exhaust systems on to customer cars and they have went on good with no problems. If you don't have a lift and are planning on doing the exhaust yourself then one of the exhaust kit companys are the way to go. The last few cars that I have done I bought the Summit kits and the "X" pipe kit and put them on but you have to do a little more bending and time on them to make them look right. 2 1/2 " pipe with an "X" pipe kit is usually pleanty for the street and occasional strip use. The picture below is an exhaust kit from Summit- including there "x" PIPE
kit and attached to Dougs Headers.