Hey Doug,
Don't feel bad I did the same thing to my '06 GT two years ago. I put some of that 104+ crap in my car...man did the
Stang run like crap. It took two techs to figure it out and he
was from the Ford dealer not the big name speed job that tuned the car. My car was dyno
tuned for 91 octane when I added the octane
booster of course the octane level increased but not my timing which threw everything off
and fouled my plugs. When you car is tuned to a certain octane us that level octane and nothing higher. I had to drive out all that gas
and refill my tank with 91 and not mess with it
anymore. My car dynoed at 320 RWHP I was
just being greedy. NO octane boost just 91 gas.