The stock tank is big, bulky and will crack at the fittings causing leaks! Our expansion tanks are 100% machined from billet 6061 aluminum with no welding. They mount directly to the OEM mounting points and use the same OEM hoses. It was designed to look great and to be tucked into the manifold as far as possible. With the tank being mounted higher than the radiator you'll be able to burp air out your system very easily and as an added bonus our tanks accept spill-free or burp funnels.