REFLECTOR: Lower cowling- exhaust holes

[Tom]

The exit holes in the lower cowling for the dual exhaust are slightly 
oversize to allow for removal/replacement of cowling. I have SS plates 
which screw on over the holes. I had a friend recommend that I attach 
red baffling material to the cover plates to make for a tight fit while 
allowing room for engine movement via the rubber. Has anyone done 
anything like this?? My concern is that the baffling material is only 
listed to tolerate 425 degrees. I have ceramic coating on the exhausts 
but I'd still bet they are hotter than that when the engine is running. Tom