That's going to be crap!
It's 12V so it will run even slower on your car even if wired directly to the ESC + and - (which I wouldn't recommend doing anyway as it's sometimes possible for the ESC to draw so much current under accelleration that the fan will actually stop, but that does depend on the fan etc)
It's cheap, but only meant for cooling chipsets etc in PC's
It will be better than nothing, but only just
You'll be far better off buying something 'fit for purpose' like the R1 Works or Geisha
My own (we're allowed 40mm fans) is a modified old LRP/Nosram heatsink with high power 5V NMB fan (320mA)
It now faces the other way with the fan in front of the motor etc, gives better weight distribution.