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high compression NA -> turbo engines. He has run one since 2005 and beaten the cap out of it on many road courses... far more punishing than spirited street driving. The cars have been dyno tuned and evaluated by one of the best tuners in the industry and found to be bottlenecked for increased power by restrictions of the NA heads. I have personally seen and can attest to all of the above... this has been the topic of many of our discussions here in our group. If the NA 30p heads are such a superior design, how come we all haven't ditched our 48p by now?
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