K20a or K20a2?

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I remember reading something on the Hondata Website about boosting a k20a or was it a k20a2? Basically im just wondering if its that type R motor whats the highest you would boost an 11:5:1 compression engine with a Eatons roots supercarger. Im currently running 6.5 psi, and think i could squeeze a few more out of it. Just may need to run an exsaust cut out vavle to open up the exsaust. Im just currious if you think 8psi would be to much?