When you put a thicker head gasket on an engine, how detrimental is it to off-boost driving? How much would it (2mm) lower comp. ratio by? Does anything else need to be done after putting one of these on (timing, fuel pressure)?

 

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I can't think of any numbers off the top of my head, but 3 years ago when I had my GReddy turbocharged D16Z6, I used the GReddy 2mm gasket to GREAT avail. I loved mine, it allowed me to boost a lot more than before...