could someone clear this up for me. as i am confused, mainly about exhaust. i have a mbrp cat-back(no header). also i will be be adding stage 1 cams in a couple of months and a tune. i know that my intake has got to go and so does the tune, but will adding a second cat clear up the problem with the exhaust or does that have to come off too? i know there has to be someone out here in ca with cat back, lol.