Miata Mailing List: June 1996, Message #121
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   From: 
Subject: Exhaust Wrap
   Date: Mon, 3 Jun 1996 17:56:04 -0400

    OK, guys, I'll throw in my two pfennigs on the subject of exhaust wrap.  
Caveats: This is based on my personal experience with the Thermo-Tec wrap and 
a set of headers from Ron Millen(?).
    Yes, the wrap cooled off the engine compartment; I could even touch the 
wrapped header tubes without discomfort.  Unfortunately, after about 8 months, 
one of the Y-sections where two of the header tubes join rusted out.  It 
appeared the wrap over the Y created a sealed pocket and condensation 
developed the pocket, allowing corrosion to destroy the metal.  Millen sent me 
a new Y-section which I had welded into place.  I removed the wrap and 
continued to use the headers.  The headers are now on a friend's car and, 
after an additional 3 1/2 years, rust free.  If I were to do it again, I would 
only wrap areas where the insulation can lay flat against the tubing and not 
allow any pockets.  Would it work? Don't know.

Later,
The BirdMeister