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

Increase cooling capacity for lower running temps which helps maintain peak power. The low altitude kit gains 4-5 horsepower mid-range and peak horsepower. For sea level to 6000 foot altitude.. Tune is requried for the 9R.. 91 pump gas is required.. BPR9ES NGK spark plug is recommended by Bikeman Performance..