Well for what its worth..I recently had my ECU reflashed by 2 ex-Ford guys with 20+ combined years in the ford ECU tuning buisness (with dyno correlation for each tune) and the subject came up from a Cobra guy. What these guys said was that on an N/A/no nitrous car with streetable lvl compression they have never seen a plug gain more than OEM Ford plugs or autolites. And in many cases, power loss was evident.
Just repeating what I heard..because I feel these guys know what they are talking about.
