a guy i know got a 1.5 mm head gasket from HKS, and he rekons that it was total crap, sopposedly none of the coolant jackets lined up straight and that kinda stuff.....he ended up putting it on anyways(prolly to do with the fact of how much money he spent on it.) and it pretty well started leaking straight away....he ended up getting a custom one made out of copper and works a treat...but then again this is only what i heard...