Mine is running custom headers, no muffler and just the factory resonator. Sounds really good. Its got a different sound. V8 at idle, not sure how to explain the sound in the revs but its unlike anything on the road. Just eliminating the muffler creates a good sound but its kind of annoying when cruising. The header resonator no muffler set up sounds way better and isn't annoying when cruising. Neither set up is overly loud.