loco_corolla

Would headers and a larger pipe to the cat make any difference performance wise??? I saw that the sportivo's already have a 2.25" pipe standard. Shouldn't that be plenty??? Only asking this question as i am thinking of buying a sportivo and i am trying to see how much power they can make but one thing i don't want is exhaust noise. So if i can keep the exhaust standard but change the headers to the cat, it would be good. Doing this on my gze made substantial gains which is why i'm asking.