Personally I think the margin for error is too much. Should you mess it up, you're going to have to buy another anyways. So...... Might as well buy the "perfromance" pulley first.
BUT, I am waiting to hear back from Jman on his results.
I had spoke to a couple of others about the KNM pulley as it has always had my attention. And the response i got was they really didn't notice any difference. That is why I'm REALLY interested in hearing what Jman has to say about the pulley with the stock sized belt. If it truly does open up another 3mm, it would have to show an increase in top speed I would think.
On his site he shows it works best with his Kevlar 14mm longer belt (757) for maximum gain. One of the theories raised was the slightly longer belt MAY contribute to belt slippage. Fingers crossed.
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