Good advice on the ladder bars, Mopars shouldn't use them. If you are having serious traction problems (like with slicks), there is a different setup for Mopars but it escapes me.
Anyway, on the exhaust, you could consider keeping those Magnum manifolds and have them Extrude-honed, and then coated on the INSIDE. It'll keep them looking stock, but flow better and provide better heat control.
