Replacing the stock hoses was a no brainer. When i replaced the clutch and figured out real quick that i had been riding on borrowed time with the stock hoses ordered and replaced with Samco. Then again had a few miles on stock hoses but was really surprised on how worn the hose coming off the water pump had become. You would think that after just 40,000 miles that the stock hoses would be OK. With over 20,000 on the Samco no bulge.