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I haven't done to much reading on tunes vs plugs for F85 and gapping vs cooler plugs.
It seams most guys that run a tune go for the cooler NGK 97506 and gap them to .022+/- or even down to .019.
If i am not mistake the stock plugs are at .03+/-.
I would guess, is if you are running a tune but your Engine/Cooling Temps are the same. If you have decent plugs (you do), All you would need to do is gap down your current plugs to .02ish.
The question would be, is it the cooler plugs or tighter gap that make it run better?
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