I have saome campbell soup cans duct taped all the way to the catalyst, the performance is superb and the sound is great. I left some cans full incase I have a craving for clam chowder, self heating soup,I'm a genius! Anyways I had the HKS and the sound is freakn amazing. But now I did something different and did a Type S Exhaust swap from headers to muffler, all OEM parts. But what u want and have fun.