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This graph shows the rwhp results with the boost plotted underneath it. It tickled 9.5 psi of boost when the engine was over 7,000 rpm. For the most part, the boost curve is linear and we saw only a few flutters where the belt was slipping at high rpm. It is just a six-rib belt combination; JPC Racing will be offering eight-rib conversions by the time you read this article.