I ran the 85mm pulley and was running 12.5 lbs with 522hp/400 tq ....never lost any top end power was strong all the way up ...but to be fair I was running the stage 2 supercharger..ran that pulley for 2 1/2 years....also the 85mm put your supercharger at about 91krpm at 7k motor rpm and 96k at 7.5k motor rpm
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