[Shane@DBPerformance]

Copper normally shouldn't be used unless you are doing an O-ring/reciever groove setup on the block/head. People have had nothing but problems with copper headgaskets the last 10 years on DSMs. Maybe these new ones are better, but the older SCE stuff was crap.

Stock headgaskets are awesome, I run 28psi on stock headbolts with them on my own cars. The Mitsu metal HGs are awesome until they start leaking between the layers. Cometics are great also when the surfaces are prepped properly. There is a reason why they stopped making the Cometic HP versions also.