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I'd put my money on the idea that we're seeing the difference between overboost and non overboost. 10 psi is too low for stock boost without The question is, did the M button somehow make the car go into (or make it more likely to go into) overboost?
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1M, GT4, 1969 Porsche 911 w/ 997 GT3 Cup Motor (435hp & 2,100 lbs)
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