gasket tech?

[4GOTNPNY]

im building a engine slowly twin turbo with dart block I want to run 15-16 lbs of boost my question is what are the advantages and pros and cons vs multi layer steel cometic style vs copper o-ring gaskets. what would be the ideal way to go?

[ZR]

MLS are the absolute best for higher boost but block and heads must be machined for them or you'll have leaks.