I use the stock Pentastar fan with a C & R Racing radiator. The owner designed this system for his own 6.4 liter Hemi. I was intent on changing my fan and he told me these brushless Pentastar fans are some of the most powerful on the market.The t-stat fully opens about 203* & my fan kicks in at 212 - 215*. That's about as good as a Semi will cool especially here in the altitude pulling these long mountain passes. The system works well.and uses the stock overflow bottle.
2014 JKU, red, 2.5" AEV lift,6.4L VVT, 35" Duratrac's. 4.10, Gen Right bumpers, VR 8000 winch, Pro Rock 44.