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Jarle,
Look at your engine and find the type number and serial number. Then, we'll know what you have in there. The '78 and '79 SC in some markets had a cat but it was different than the ones used in 1980 and later, when the O2 sensor was used. Shoot a picture of the muffler also, there were a couple different ones that had a small pipe going in to them.
JR
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