I had the resonator replaced with a straight piece or pipe and replaced teh stock mufflers with summit fully welded mufflers which are chambered style. They hav ea nice rumble an dno drone, plus they are $38 each. The 3" chrome rolled tips look great too. I have $66 magnaflows on my wifes 04 Monte and our two cars sound almost the same. I thought I would give the summit brand a shot, and I am happy I did.