I could back off exactly 19 teeth off the spring adjuster ...
you should have just back it off 2 teeth(counterclockwise) and not drill it...this i have done on my previous car(not a porsche)...just don't want to respond on your previous post(due to no dyno sheet to prove)(everybody wants it to know if it can be proven)...basically backing it off(loosening the tension) will put you on a richer side..loosening it richens it(now this where the ignition come on)..
just my 0.02 cents..
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