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the 79-80 header will have a different flange and uses a different presilencer than the other headers, as the 79 "cat back", actually heat exchanger back, is a different length than the 81-85 systems.
i have no idea why there is a different header for 81-83 and 84-85. they all use the same size presilencer...
notice the road race header is 79-85, the difference in the others must be small
mike
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