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The upgraded twins will make peak power well below 21psi of boost. Running 21+psi really only has an advantage at lower engine speeds where the engine/turbo isn't struggling with backpressure. That will result in more midrange torque but also a lot more heat and octane sensitivity. If you guys want to run big boost, you are going to have a hard time short up running a turbo that is capable of running higher pressure ratios efficiently.
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