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I have read the entire thread on competition diesel that was max spool vs. F1 and it was a heated debate there was talk about running a test between max spool vs. F1 vs. stock, they did the test on a 3rd gen but no 2nd gen, I am trying to get info on PDR vs. F1 or vs. max spool and if so if someone has run one of the them, I am trying to get everyones opinion about the cams. Thank you for all of the opinons.