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Are you refering to the tubular fiberglass sleeves that slip over the boots and plugs? My headers are very close and radiate a lot of heat but so far the sleeves have prevented any damage to the rubber boots. Previously the boots without the fiberglass sleeves turned very soft and mushy after a few months.
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Rick
As you slide down the Banister of Life, may the splinters never be pointing the wrong way 
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