Well I'm selling my RB 2.5" exhaust and I'm going to have around 600 bucks to work with here to replace it. I'm feeling just getting 1 muffler and fabbing up the piping. Pretty much I'm looking for a good muffler that will keep the car quiet because I like how quiet the RB exhaust keeps my car. Any suggestions? I'll be going with a 3" maybe even 3.5" exhaust piping incase I decide to upgrade the turbo later.

 

Have you looked into a Borla XR-1 free flow muffler??
It's amazing how much this muffer will quiet down a noisey exhaust set up, plus it's straight through. I recently installed one and was quite impressed.

 

you can theoretically stuff two of the oval shaped borlas in there..