Take your Boost to the next level! This Power Dome™ head set designed specifically for the Polaris Boost engine climbs to a new performance altitude with an impressive increase of 5 horsepower peak. Its unique dome design increases combustion efficiency to ramp up top-end power and also provide much broader performance at all throttle positions, including ultra-responsive bottom-end. The stable nature of this SLP exclusive head design makes the engine very tolerant to additional performance and is compatible with 91 octane fuel for optimal convenience, reliability and consistency. When used with the stock exhaust or an SLP Lightweight Silencer (see stage 2), no fuel modifications are required. If used with other modifications or parts combinations, additional fuel or additional octane may be required, please inquire.