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I'm going to scrap the Diablo idea and go with a custom dyno tune -- adding a ported TB, headers and the tune. I'll do a baseline dyno (I already have Volant and Borla) to see where it is and then another after TB, headers and tune. It'll be a couple of weeks since I need to schedule some time to leave the truck. (The headers take some time to fab). Looking forward to sharing results.