treason84
I also got such sound using a sard fuel regulator on my sgti when i start my car morning. Does it sound like whistling? When i first install it, i set it 40 psi. the noise come every morning when i start my car. Go back to mechanic, mechanic said may be fuel pump complaining. So reduce to 38 psi, still got it from time to time. Mechanic recommend to upgrade stronger fuel pump. But since not yet kong, wait until fuel pump kong only change.
Got another sard user using on a stage3 Rs sgti setting on 45++ psi, he said also got such noise but he said is normal. So not really sure, any other sard fuel regulator feedback?