I took my tailpipe off yesterday and tried to gut a little of the inside of the muffler. i then drilled a bunch of holes in the muffler. It sounds like a big rig now
The turbo swoosh is much better too. I decided i would do this and destroy my stock exhaust since I am ordering an exhaust from jegs. They have a 4" t304 stainless steel exhaust for out trucks for $499
http://www.jegs.com/cgi-bin/ncommerce3/ProductDisplay?prrfnbr=156861&prmenbr=361

http://www.jegs.com/cgi-bin/ncommerce3/ProductDisplay?prrfnbr=156861&prmenbr=361