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the PE1420's don't seem to respond too well to the manifolds... - they don't match up properly - the PE1420 design is specifically for improved boost response with smaller ports. In turn, it gives up some top end (who can really use more top end then 500rwhp???). As a side result, the manifolds do not seem to be as effective because they are not the true bottleneck. The turbo is.In order to achieve 500rwhp on pump gas, I plan to install a computer controlled water injection system.
 
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