This Straightline Performance billet head kit is built for Ski-Doo 500SS, 600MXZ, and Summit snowmobiles running at elevations of 6000 feet and above. The kit is designed to match the thinner air found at high altitude, helping the engine run the way it should when the terrain climbs.

It fits 2004-2020 models, so owners of those machines can bolt on a purpose-built head rather than settling for a one-size-fits-all setup. The billet construction gives the head a solid, machined structure that stands up to the demands of mountain riding.