[Nutbutt]

I guess I don't know what to explain. The pipe install should just run right where they are replacing the existing system. The resonated x would be right after the cats. It seems by your description you are replacing every thing from cats back to tips. If this is the case have you looked into any cat back systems ? When I did mine I went with the solo Mach cat back which included the resonated x-pipe and the tunable j-pipes which got rid of the drone. It was actually more cost effective than piecing it together.
There are axle back j-pipes you could add later if the drone is too bad.