A 3 inch single cat back system with a dynomax bullet on it. Or run a 3 inch pipe from the cat to a 3 in inlet cherry bomb extreme with dual 2.5 outlets. no dumps or nothing just straight out of the muffler.

 

I can't speak to the mufflers you ask about. But the more metal *pipe length* and the thinker the metal walls.. the quieter it'll be.

To do mine all over again. I'd run a 2.5" mandrel smooth bent pipe from the cat to a Y. Then have 2.5" smooth bent pipes go over the axle and out behind each tire.

I sorta have this now except I have a magnaflow muffler and the last 2ft of each tail pipe is thick wall regular exhaust pipe steel. It's a little too quiet until the rpms get up to and past 2500. Still sounds decent.. just a little too quiet at lower rpms IMO.

Rich