Pypes A body exhaust or Summit Which one should I choose?

im getting the pypes 2.5 inch exhaust with x-pipe for my 68 cuda. im only getting a few parts from them though..the x-pipe for an A-body, the collectors, and violator mufflers that have the in and out on the same side of the exhaust like the challenger T/A exhaust...it will exit in front of the rear tire...