Cross over pipes work well the closer to the headers as possible. On a muscle car they usually have good results, on a 4x4 with a transfer case you usually have to put it behind the tranny, this makes for poor results. In my opinion you would be better off getting some good aftermarket headers, mandrel bent pipes(probably won't need bigger than 2.25",unless you go single than 3"), high flow cats, and a good muffler (I like flowmaster).