if u go to a decent tuner and your metering unit is in sound condition my fueling is fine on 21 psi with the fuel pressure mod, it wasnt without it!, get it setup on a re-mapping company which sets your car up on road loads,

had my car off the clock the other in a very short time didnt pink or knock at any stage, a credit to apt,

turbos blown up now so thats at pts now!.