I don't know how far you live from atlanta, but I'll throw this out there. The only personal experience I've had is with two muffler shops in atlanta; they are a midas and an independent place called S&S muffler right next to one another on Northside drive near Georgia Tech. S&S built me a full 3 inch catback with a magnaflow straight through muffler for 300 dollars. It's crush bent piping but it'll do what you need it to and sound pretty badass. The midas next door quoted me 400 for the same 3" catback but they mandrel bend. The guy at S&S (Rodger) ended up only making like 2 significant bends and they were both after my rear diff where there is very low exhaust pressure, so I'm getting the same gains as a mandrel bent setup. If you want the address and number of S&S, PM me. I highly reccomend them.

Good luck.