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Looks like there was some detenation on the intake side. It wasnt lean, but more than likely a little heavy on the timing at that boost setting. Detonation at high boost, will crack the cast cylinder. Not enough fuel will create heat and cause detonation, which would have torch a hole in the piston and crack or melt the cylinder too. Take the detonation and call it a win you really didnt want. Check the piston at it's ring lands for any signs of damage. I'm willing to bet there will be none. Find a replacement cylinder and put it back together. Set a overboost level and drive!
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