depending on what you already have as your mods. "I see your signature says too many to list" I say if you already have, injectors, TB, plenum, cia. next step up would be maf. But make sure that it's calibrated for your size injectors. Because there is a lot of cheep maf's that you can buy from lightning that are brand new in box for $79, but remember they are not calibrated for injectros.