Stock fp with a non adj fpr,is typically 30-33psi at idle with vac,and will jump to 42psi or so,under load.If you were seeing that much on a stock reg,then the reg was sloppy.If you trim it out to where I suggested,you will get better gas milage,along with smoother acceleration,and most likely,...a little more power.At 85k miles,your injectors have seen better days,and tend to become sloppy,and puddle with stactic pressures above 48psi.Your present combo doesn't warrant the need for extra fuel at this time,so why waste it?
Teal94GT,Kenne Bell 2.0
(16.5psi),Ported Manifolds,World E7s ported w/3 angle valve job,Steeda #19 cam,MSD Ignition,3:55s,Snow Performance water/alcohol injection system,FMS Cobra Clutch,75mm TB,MAC CAI,Phantom Gauges,all the other typical bolt-ons,....and a good set of bald tires
!.........Mustangs are like our women,...you have to put up with a lot of crap to get what you want,but when they put out,life is good!!