Ive been lacking on checking the FPR, but im going to put a puel pressure guage on and drive the car, see exactly what the pressure is under a heavy load. After replacing the injectors and knock sensor though, the pinging is considerably less, but is none the less still there. But the differnce the new injectors made is a night and day difference! Smoother idle, better throttle response and im thinkin better mileage too! well worth the investment.