I can attest to the rust under fiberglass exhaust wraps. I't's BAD. I think Christ's double pipe is best and would actually protect the pipes from rust.
Quote:
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The best insulator is dead air
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Not quite... The best insulator is
no air... Double walled evacuated stainless pipes anyone?
Interestingly the Previa's header is twin wall stainless. In the sae paper they only mention weight (as opposed to cast iron) and noise as a reason for the double wall.