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No, the SSI's are a 'cmplete' heat exchanger ... i.e., can be made to provide heat with modifications to your air duct routing.
Those pre-'75 'headers' had the rusted heat ducting removed. A new coat of silver paint is what you see ...
And, yes, you need an early, double-inlet muffler, too!
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Warren Hall
1973 911S Targa
1992 Dodge Dakota 5.2 4X4 parts hauler
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