just wanting to know if i can use like a gas treatment in the gas can like one for cars and how fast can you run your engine on muffs? its a 63 50 hp merc 500
What we call "muffs" is an attachment to feed water from a garden hose to the engine for running it out of the water, BL.
They are a semicircular frame with large suction cups at the ends to fit over the water intakes of the outboard. On of them has a connection for a garden hose.