Straightline Performance / Holtzman Engineering Proven Performance nitrous kits with over 15 years of Nitrous Performance. If you are looking for the #1 selling nitrous system for your Polaris 800 AXYS this is it! Completely model specific and all pre-set for your easy installation. Straightline’s patented nitrous nozzle with flow control makes the kit 100% reliable with no issues. Works incredible on the new AXYS stock or with aftermarket components. Standard kit is 30hp. Kits can be purchased with more HP at no charge, just mention what HP you are interested at time of purchase. Dual stage race kits available via phone. Get yours on order today.