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as stated above, you need to find a way to promote gas flow through the wastegate hole since you promoted flow through the exhaust wheel (hince causing it to spin harder/faster, which made it overrun the wastegate acutator).
AKA either restrict the exhaust, or port/hog/upgrade other stuff.
good luck.
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My street car runs low 11's and my race car's personal best is a mid 11....
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