We installed the Tomei Expreme Ti catback exhaust, test pipe, downpipe and O2 housing on our Evo 9. The car was running a factory tune and hitting 19pis dropping to 16psi. We noticed a gain of 46hp on pump gas. The weight savings was almost 40lbs! These are in stock and send me a PM for a price quote on Tomei or anything else you are looking for.