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12 AFR is just too lean for pump gas. I didn't even notice that much difference when pushing from MID 11s to LOW 12s when I was "looking" for the difference. You make much more with boost/timing.
Those that run LOW 9AFR or less are just crazy. Yea yea, STIs run rich from the factory but LOW 9 AFR is just ridiculous and I STILL think cylinder washing/bearing smacking could occur.
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