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into around 19 psi. That is due to the stock wastegate actuator spring limit. I only run this much boost on e70 or greater. I agree with others about exceeding the efficiency range. It's one of the reasons I won't alter the wastegate actuators to allow more boost. My car feels amazing on ethanol, btw. Been running it (back and forth with 93 octane, using an SZ tune switcher) for over 3 years and I love it. No problems at all, and there is so much usable power for the street.
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