Here is an interesting idea.
the spring keeps the heat shield spaced out
from the tangential muffler and allows air to
flow through for cooling.

Paul Lamar

The exhaust seems to be aimed at the rubber bushing motor mount. Even with
some cooling air, this could be hot enough to catch it on fire, or melt it,
especially during taxiing. He may be able to construct a small stainless
shield completely over the mount to protect it, but you'll need to check it
during taxi testing. My exhaust manifold was about 4" away from the mount,
and I had to construct a shield. It worked fine.

 
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