The only mufflers they sell outside of the systems are the DB mufflers.
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Thanks for the name of them JennaBear, does anyone know where I can order one? Also, the datalogging that I would do if I got your cable to get my truck programmed, how much for how long should I drive my truck to get an accurate reading for your tune? A couple of 30 minute commutes to my work? Highway and/or city driving?
here you go
http://www.jegs.com/p/Corsa/964933/10002/-1?sendroicid=bbef8492-2d00-41d6-b158-38db0de2603c&sendroiad=2621970939&sendroikwd=corsa+mufflers&gclid=CLHOi6CospoCFRwpawodmkW3bw
the only thing is i dont think you can get them in 3in if running a single exhaust. for i denalli you could prob run two 2 1/2 mufflers and run true duals since they dont come with a "y pipe" into a single.