Muffler Help

Hi i have a 2005 grand am and want to know what size in/out the ga has so i can get a flowmaster for it, any help will be appriciated
thanks

Get a camro/firebird muffler. Stock piping is 2.25 but not sure if you can get the muffler that size. Most people just get single 2.5 in/ duel 2.5 out. You going with an 80 series?