I plan on doing a muffler swap with my 4.7
Mine came stock with the single exhaust
So I'm still trying to choose between just swapping the muffler and use my stock tail pipe/resonator OR just dumping after the muffler. I'm not too excited about those fumes building up under my bed like that though..
Looking at 18" Magnaflow (or mufflex for easy install) or a Flowmaster 40.