The C7 fan is a good fan for 16" and 600w. The CTS-V fan is a bigger option at 19" and 850w if you have the room for it. Tuning wise it will be the same as you can plug and play a V fan in a C7 with a custom shroud like Dewitts does. Thats the fan Stielow has used before as well. Either fan is around $300.
The CTSV fan is impressive, but most classic radiator shapes don't have enough height to accommodate it without a custom radiator.
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