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So my wife ran her 488 last weekend and sled ran great. Started fine and no issues. Started today and it made a sound that obviously wasn't there last weekend. As soon as it started motor revved really high and made a funny sound like a exhaust leak? Didn't want to stay running. First thing I did was compression test which was showing way low at 75lbs each cylinder. I'm going to tear down tomorrow because obviously something is wrong but why would it make the sound? Could it be a gasket failure somewhere?