Actually the guys at the local club here use the MM motor cooler with great success. If you're running mod, it lets you gear up a little. The motors are also much cooler on the first few laps and have a definate power advantage.
Cooler with a fan alone is okay if you have the time, but the motor won't get below ambient. The MM cooler can get quite cold!...
The local shops here have basically run out of stock... as soon as a new batch arrives they get snapped up like that..
