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1.5 - 2 PSI per 0.1" smaller
62mm TB seemed to add about 1 PSI and of course better throttle response and more flow is always better
since the stock pulley is a press on style it takes effort to get it off and a modular hub on. once the hub is on though new pulley changes are SUPER EASY, 5 allen bolts and the pulley slides off
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