With my S14 motor in my 95 240sx I ran a 13.2 a 9psi At the track, I never ran it on 15 psi. I had light mods like FMIC and Exhaust and DP.

I NOW have a SPEC stage 2 , Greddy pulleys , Fliudyne fans ( no clutch fan) Greddy boost Profec. HKS super Seq. and hoping to run again soon!!!!

Im thinking consistant High 12's and about 25 MPG on highway...
I have had no problems with my S14 motor and I would not change.

Swap was done by me at my shop , and out of all the redtop swaps we have done not one of my customers with the same mods can keep up , Even in the lighter S13 chassis cars!