Gapping has more to do with the horsepower than the brand of plug. I'd like to see a dyno pull on 5 or 6 different plugs. Any plug within 2 hp would tell me they are not really any better than the other, but 5-10 hp would definitely tell you a little more.
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-Mike
2015 Mustang Ecoboost
MBRP Race Exhaust - Lethal Performance Downpipe - Cobb AP - Adam Tuned
JLT CAI - UPR Dual Valve Catch Can