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Message: [QUOTE="HS-MotorsportsDallas, post: 1474802, member: 19010"] Bryce, what do you do with your truck, what elevation are you at and what didn't you like about the 66mm? A lot of sizing will depend on what you do with your truck and where you live. The 64mm is my personal favorite on these trucks and tends to work well for a lot of guys. Bigger is an option if you're ok with sacrificing a little bit of spool up for power, live at a lower elevation, don't tow often or very heavy, etc... Something else to think about, that often gets overlooked, is that larger turbos won't make much more power, if any, over a smaller turbo on stock fuel (or insufficient fuel). The 64mm turbo is about as big as you can go on stock fuel before the increase in power is so marginal that it doesn't make sense to give up the drive-ability. I see plenty of guys running 369's or big S400's on stock fuel and just shake my head because they are giving up power because of the lack of fuel and drive-ability because of an oversized turbo. It would have been better to go with a smaller turbo that would have made similar power with the given amount of fuel but retain a lot of the drive-ability. [/QUOTE]

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