Billet Head Kit - High Altitude - Matryx 9R - Polaris

Increase cooling capacity for lower running temps which helps maintain peak power. High altitude kit gains 8-9 horsepower in the mid-range and 7-8 peak. Works in the 6000 - 9000 foot altitude range. Tune is required for the R9.. 91 pump gas is required.. BPR9ES NGK spark plug is recommended by Bikeman Performance..