How thick is the stock head gasket? I noticed in Summit racing catalog that SCE is making copper gaskets for the SE-R. Has anyone used one of these gaskets? Any thoughts or comments on this product. Is there any advantages of a copper gasket?

i dont recommend using copper head gaskets if you dont plan on getting a huge turbo. copper head gaskets have trouble sealing coolant and sometimes leak.

So how much is a stock head gasket? Are they expensive?