Can i add a few things to your choice. i own an r34, with a K&N panel filter, 3inch pipe running from the front spoiler(were the stock intercooler sits) running straight into the box and then ive got a high flow cat into a 3inch exhaust. ive tried pods and different exhausts but this seems to be the best performing. also the EPA hates you if you go for the pod and it does suck in engine heat which makes it fire with less combustion. hope this helps