N/A Go with stock gap .054" and so far the plugs that I have bought have been pretty close for N/A, but that doesn't stop me from checking them. Now I have to regap all them due to supercharger .035"
97 Cobra. Bassani catted X-pipe , CDC Side exhaust kit, 4.10's, Upgraded 11" 26 spline FMS clutch T56 Magnum 6 speed. Forged Internals, JE 9cc Pistons, Vortech V-1 S-Trim 3.33" pulley, AFM PP SCT BA2400, 55lb/hr Inj. 501.71HP/415.4TQ on Mustang Dyno