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Message: [QUOTE="LakeBum, post: 1482729, member: 29126"] I have a SD truck. The kicker is I have larger then stock tires (35s) which gives me lower RPMs for any given speed. I also have a 4 speed auto and cant just pick a gear and run the RPMs like you can with a 6 speed. You are correct, there is not a lot of info on the 363. There appears to be more info on the 364.5 which for me it comes down to which exhaust wheel. DP Tuner, Carson, Barder all say 68 but there are plenty of threads with guys running a 74. So it begs the question. Which one is best for stock to 160/80s and 35s? [/QUOTE]

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