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Taking the innovation of the Mod Kit from the Pro RMK and converting it to the Axys RMK with outstanding results. The Axys Mod Kit provides an additional 13 HP gain on the top with 7.5 Torque increase. The Mod Kit is designed to run on pump gas and we use a Bully Dog GT so there is no rider tuning required. If your ready for arm ripping power then this is the kit for you. The MTNTK Mod Kit is a great increase in power while keeping the integrity of the motor by using the durability kit aka "Fix Kit."