I don't think the exhaust is obstructed---it just doesn't feel like it somehow. The cat is original (unless it was replaced, long ago, with a genuine Volvo part) and the rest of the exhaust is Bosal and looks like new. Not sure about the mixture---don't have an exhaust gas analyzer to test it with, but it makes no visible smoke, and doesn't even have much of a smell. Bosch cap and rotor, Bougicord wires, NGK BP6ES plugs, all of which look even newer than the mufflers. The battery was NOT disconnected before the snorkel-less run.
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