Those are some huge fins around the motor....Of course, I assume, the bigger the fins and vents, the cooler and smoother motor will run. I bet, Chris, big fins is a much needed addition, keeping the motor cooler at potentially peak 1500 watt performance ( eventually after overlooked modification done)....Bafang motors seems to be continuing giving what we U.S. consumers want: More power! Court hopefully will test ride this motor at interbike next week; he might want to consider wearing a motorcycle helmet in test ride, j.k. Bosch company should pay attention to consumers wants (more powerful mid-drive motors) or lose out.