its my understanding that the camaro 3.8 and gp 3.8 are exactly the same. from what ive seen the camaro sounds way better than the the prix. im guessing this is because of our exhaust setup. unless im wrong this is my theory... if one were to be able to make equal length headers and pipe for the grand prix then it should sound very similar to the camaros. im asking because this local muffler guy is like a pipe guru and hes friends with my dad and i might see if i can pull this off. so am i missing a variable here or can this be done?