Right now in stock form 4.5 HP at the rear wheels on our dyno. With our head porting and cam along with clutching we see 7.5 to 8 hp at the rear wheels. We have been testing after market intakes but so far some of them have shown a loss of 1 to 1.5 hp . I to would like to see a single seat rzr with the XP 550 motor.
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