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I have figured out that my car is running out of wastegates. We will probably modify the wastegates with stiffer springs so we can make more boost. Looks like the car does peak at 25+psi but it drops back to no more than 1.6kg. Here's the dyno sheet: 
It makes good power curve under my low boost setting(1.5kg) but the boost is all over the place if you turn it up. It made over 530rwhp at 1.5kg(21.3psi) which is not bad for the street. Zo ----------
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