I just installed an AEM adjustable FPR on my car, and had a custom 2.25'' catback exhuast w/no resonator/catalayic converter. After i installed these both it feels like ive lost some torque in the lower rpm's, higher rpms also feels a little weaker. Now ive been running around 42 psi on the FPR, is that a good setting for a b16a with just intake/exhuast? Is this exhuast to big for my application and should i put a resonator in? Thanx