Adding Woody's snowmobile studs is a must upgrade. Snowmobile studs are more of a safety factor than a performance factor. Even on a tight budget, leave enough money to install Woody's snowmobile studs. Demo installing Woody's snowmobile push throuh studs and how the length of stud to install was decided. The snowmobile studs need to be balanced with the amount of carbide in the runner. Woodystraction.com has an excellent resource to find the amount and length of studs to install and the amount of carbide in the runners for optimum balance and performance. Stick to what the pros recommend.