Stealth - I added an Evercool 30mm fan (p/n EC3010M05CA, Google it, they sell for $4.99) to my standard LRP heatsink. This is way better that the cooler kit as it moves more air and the standard heatsink has more radiative surface.
In FL, during summer, with a 4 star we can shut down in 4 min like clock work with the standard cooling kit. With my setup we can finish the race most of the time.
Under the same conditions with the new IB4200WC cells Novak system thermal at about 3 min and Brushed motors either shift or throw winds and lock up.
This is for the fast guys. The slower guys dont have as many problems becuase they are not working the systems as hard.