I have heard so many different things about double stacking headgaskets I don't know what to do. For one how many points will it lower your CR? I have heard that they leak, but have also heard they don't, which is true? What should I do, how should I lower my CR? I have a 91 GTI with a counterflow head and a Audi 80 3A block. I'm putting a G-ladder on with only 12-14 psi, only want to lower my CR to about 9:1.