I haven't heard a lot about the pulleys. But any time the blower makes more boost by changing pulleys, the impeller is going to spin faster. I'm not sure how fast the impeller can spin before frying the bearings inside. I believe powerdyne makes an 11# update kit for their blowers. I don't think the belt driven PD was intended for serious race action, and modifying the impeller speed is going to start hurting stuff. You couldn't be doing that bad with 391 rear wheel horses!
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