Only 15 psi...well what if I decided later on to swap turbo's? What kind of fuel management do you mean? This guy told me once that he had a friend w/ the Greddy 18G kit on an SI and he was running at 11psi and was only gaining about 60hp! If I decide to get the Greddy kit I dont wanna run into that problem. Have you ever heard of anything like that before? ∙Thanks∙