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It sounds more and more like unless you have ridiculous research resources at your disposal you should leave the DI portion alone and mess with the PI and the percentage between the two. Unless there are areas that are well known to be optimized for, say, clean burning or economy and the way to change them to be optimized for power is well established.
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Necessity may be the mother of Invention but Desperation is quite often the father.
“Sex is like Bridge. If you don't have a good partner, you'd better have a good hand.” - Mae West
Papa said, "son there's a lot of evil temptations out there. Best to try 'em all so you know which ones to avoid."
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