Mandrel bent pipes are the key thing I would look for in a performance exhuast. The pipes should atleast be aluminized steel, stainless would be best but would most likely double the cost. Also if you wait a little longer Flowmaster might come out with a pre-made system for those trucks. I got a pre-made system for my 97 Ram back in 98 and it only cost like $200, with dual rear exits. Summit Racing has real good prices on Flowmaster systems.