mopar sound

the size of the manifold outlets are diferent on alot of diferent manifolds, but if you go with 2½" dual system with some kind of chambered mufflers it will sound bigger at idle, the pipesize makes a diferense and the bigger pipes the "bigger" the sound will be;) but there is no way you will need more than a dual 2½" unless that 318 is making alot more power than most of them do, not to put Gotdart down but i dont like turndowns alot they can make added resonace inside the car and if the floor of the car is not in perfect shape you may endup with more exhaust fumes inside the car, and having the tailpipes routed all the way out back can with a nice set of tips on the tailpies make a diference in the aperence of the car bigger than most believe.. if there is anything more just keep on asking:)