Improves acceleration, mid range, more top end, and quuick backshift for aggressive trail riders needing more than stock from their Cat CFR 800. Accelerator Kits offer maximum performance and easy bolt-in installation. Designed and tested to work in trail type snow conditions, not 500 ft. ice drags like many kits on the market. Bolt in and go, but if you add power enhancing mods the Quick Adjust Cam Arms allow for quick and easy tuning options. Kit contains QACA arms, fasteners, primary spring, helix assembly, and instructions with baseline settings plus tuning tips. We gained 3 lengths in 1000 feet and 2 mph. Most important add-on for any rider; put more power to the snow. We have tried different components but if it doesn't improve performance, it won't be in the kit!