I think it was here that, maybe wordslinger, says that the naraku face yielded good results. I'll see if I can find it.
My opinion, an aftermarket one could stay cooler to avoid slipping and belt wear. And I imagine if it's angle is different that it could affect performance.
I'm getting a malossi one from a 49ccscoot forum member that has the built in fins, and he sand blasted it for grip.
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