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.
I am in Georgia
I tow some and kinda heavy
I didn't like that it fell on its face way to soon
I am about to go to a 369 sxe with 30 now to see how that feels right now I have the bd compounds on stock fuel
But I have a lot done to the truck
The engine has
New rods
New bearings
The block
Has new delipped fly cut and coated pistons
stage 1 cam (colt)
New water pump Oem
heads stage oringed
New Molly push rods
Stage 2 valve springs
New oil cooler oem
New high pressure fuel pump
Arp studs
No limit intake
Bd manifold
Rudys hd uppipes
New gaskets from top to bottom
Egr ******
*** gone
All new injectors and injector lines (ford) I have 30% nozzles and ported rails
Maryland crankcase vent
Maryland oil filter cap
New fuel cooler
Fass 150
Dppi coolant filter
H&s mini max hd 300 with custom tunes
Snow performance stage 3 mpg max
4in down pipe 5 in after to a 7 in tip
New bd turbos 73/59 combo
Fuel bowl ******
Mbrp cold side cac pipe
Mishimoto intercooler
Diesel site boots and clamps
Beans sump
All I can think of off top of my head
O and built trans
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