[17CamaroZL1]

With the 2" collectors on the stock exhaust manifolds, replacing the 2" pipes in the back is not going to add any power. Even with headers and X pipes that increase the size to 3", many have claimed 0 gain from replacing the stock muffler. You'd think there would be, but maybe a larger size isn't needed all the way back there, as the exhaust gases cool quite substantially by the time they make it that far. Idk