Originally Posted by rampage918
Oh ok, thanks alot for the info. So then I think I will just buy the vafc for now, but later on add the throttle body first followed by working on the head. Another question I have Jasma headers and a Apexi WS 2 on a stock cat. I wanna get either a testpipe or high-flow cat, any suggestions on which one and what size 2 1/4 or 2 1/2?
2 1/4 is the american spec and 2 1/2 is the jdm spec so you will have to get a 2 1/4 most likely. at this satge in your car you wont see much gains from either test pipe or high flow, you might gain some top end horse power but will probably lose some low end torque. once you do cams or turbo then it's more feasable. But go for a test pipe because once you put a high flow on you cel light will come on and youll have to buy a ziptech o2 simulator so you might as well jus put a test pipe since your cel is going to come on in either instance and a test pipe is cheaper than a good high flow. but if you have to have an emissions check or you are smog concious put on a high flow