What exact pressure your car is best at may differ a little from someone else's. It has been a long time since I even looked at mine, but I think it is around 38 psi. I don't know what kind of pressure it gets once moving, as my gauge is mounted under the hood.
To adjust the pressure you need to buy an adjustable fuel pressure regulator. The stock regulator is not adjustable.
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2006 Mustang GT
1990 LX
GT-40 motor 262 horsepower, 307ft-lbs (sold but forever loved)
1998 Contour SVT
Rice Haters Club Member #244
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