How do you pick the right size exhaust header tubes for your engine? This episode may set you in the right direction. In episode 4 we famously destroyed a set of Hooker headers with a hammer to see if dents in tubes really make a difference in performance. Shockingly, they kinda didn't. Folks said our test was flawed because if dents in the tubes didn't affect performance, then the headers must have been too large to begin with. So now we've tested that theory, running three sets of Hookers on the same engine we used in the header-bash episode. We tried 1-5/8, 1-3/4, and 1-7/8. Were the viewers right that we'd picked wrong the first time? Find out in this episode of Engine Masters, presented by AMSOIL and supported by Mr. Gasket and Earl's Vapor Guard.