I have a Magnaflow muffler and I plan on getting rid of my scuba and replacing it with a Vibrant resonator and catalytic converter and still use the Magnaflow out back.

 

FWIW, turbo, 2.5" DP, 3" s-pipe, 3" Magnaflow resonator, 2.5" mid-pipe and 2.5" TRD axle-back. Headers are louder than a turbo and larger pipe diameter is generally deeper and louder.

 

Quick update for anyone considering this:

I have a header, which I did not take into account when putting this exhaust together. I replaced my scuba with the vibrant ultra-quiet, and had a vibrant muffler with turn down replacing my oem muffler. It was extremely loud. Loud enough that I had the scuba put back in. If I had the money, I would have simply put a high flow cat behind the vibrant ultra quiet to get rid of the rasp and quiet it down significantly.


Now, putting the same setup on an xb with the oem exhaust manifold would sound much different, since the catalytic converter in the manifold would reduce noise and rasp greatly compared to a free-flowing header.

Sorry everyone, I got a little ahead of myself with this mod, and didn't quite think it through until we were hacking up the scuba piping to make adapter pieces.

 

FWIW -- I have the same header as Roller_Toaster, 2.5" S-Pipe, scuba, and Tsudo 2.5" dual scuba-back. The sound is mostly a lowish rumble (a little similar to Fred's I think), but when the header wakes up (middling rpm plus load), it gets fairly loud -- I definitely wouldn't want it to get any louder.