From my experience, the hardware is more important than the piping. But also, it depends on where you live. Down here in the TN, I can use whatever and have zero corrosion. When I was in Chicago, only SS would do.
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1976 Mazda Cosmo RX-5
1976 Mazda Cosmo RX-5
2003 Toyota Tundra TRD
2015 Toyota 4Runner SR5
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