Those stock hose clamps suck ass. They don't have rolled edges so if you use it with the especially soft 5/16" hoses there is a possiblity of piercing through. Basically what i have learned is to use the nissan hoses with nice clamps. Most people don't realize how bad the 5/16" hose is because they live in warm places, but once it turns cold it leaks no matter what you do.