you should be good up to 8psi since the botom end built. Right? The kit should have come with a fmu. My friends did. Unless that's something that they don't include anymore, as he bought his about 6+ yrs ago. I have one I can sell you if you want. It's a FMU from the greddy kit that my friend bought. Works good on NA or turbo :woowoo: :yes: