yeah if you want a rumble, on these cars you have to install a cam. no exhaust alone that ive heard gives these cars a low rumble. still do an exhaust by all means just its just fun haha, but cam=rumble. as blueguy said, for exhausts you want to look at ones that dont have chambered mufflers, which means stay away from flowmasters!!!! haha you want to look at borla, corsa, slp. im not to sure about dynomax, their exhausts are cheaply priced and i usually go by you get what you pay for (although there are sometimes exceptions), and i havent heard a dynomax exhaust i liked on a grand prix yet. ive heard borla's they sound good, i have a corsa myself and i love it! and slp's sound pretty good too. but borla and corsa are definitely the top 2 brands for exhausts for these cars. ill attach some vids so you can hear mine (remember cam=rumble and i dont have a cam so dont let that steer you away from corsa haha). ok so after all i said about exhausts what i would recommend doing is looking for a USED borla or corsa catback, unless you want to spend around $1200 on a new one lol most people wouldnt, i wouldnt (i got my corsa catback used for $425). a used catback is going to be just as good as a new one, borla and corsa used stainless steel so no rust. worst thing would be scratched tips and you can always polish those, or if the scratches are really bad save up for new tips. you wont find a used borla/corsa catback in bad shape unless someone literally beat the sh!t out of it lol.
