Note:Our retention spring kit is designed for high horsepower k-Series cars running our dip stick. The K-Series are known to have crank case pressure issues. This increased pressure can push the dip stick out. Our retention spring kit is a simple way to ensure the K-Tuned Dip Stick remains held in place. This will work on all K-Tuned Dip Sticks, we integrated the hole since the beginning.