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It seems to me this happens mostly on tuned automatic transmission S55s after revving into red line or doing an aggressive downshift. This issue appears to be far less likely with manual transmission owners that don't go deep in the red and know how to rev-match. I would feel safe with the 550 crank horsepower from BM3 stage 1 93 octane. Do you really need more power than that? Even stock, the car is a monster. I feel people get too excited about E85 tunes
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