how do you know i havent tested them

how do you know that i didnt buy a complete cometic gasket set, fit all of them and have the exh manifold blow around the exhaust ports

how do you know i didnt take the manifold off, check the gaskets and find they were like kellogs cornflakes packets pritt sticked together with tin foil


and lastly, how do you know that its not the case of them being thinner.. its actually the QUALITY of the cosworth racing ones compared to the utter shite cometic ones

have YOU actually tested them?