hey guys i have 1 7/8 arh with a catted y pipe and corsa touring, its perfect now not too loud.. im planning to remove the highflow cats since im installing a supercharger, so i bet its going to be so loud..

any suggestions to quite it down.. probably a magnaflow muffler before the corsa?

 

Why would having a supercharger have any effect on the cats? Vettes have cats, CTS-V's have cats as well as Cobras.