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My tuner had to level header mating surfaces with a 2 foot file to get surfaces perfect for mating to engine, i told him we sometimes use 2 gaskets and silicone, he just looked disgusted and said thats bs and not proper. And the silicone messes up the sniffer on afr tuning. Needless to say 1 gasket perfect fit = no leaks. Gonna do it right or what.
