i recently installed a z1 motorsports ecu in my car(with their boost jets). since this time my car will spike 17lbs and falloff to 15lbs arount 4500-5000rpms. i think that it holds 17psi too long and am worried. heres a list of whats done, any help you guys can give would be great
2.5" turbo's back exhaust ngk platnium step colder plugs jim wolf pop charger intake autometer cobalt boost gauge