Be sure what you get is reinforced as-high-temp-as-possible rubber. I've seen some that looked like they were a simple thick sheet of plain tire rubber- which MELTED, then broke due to the heat in our very short exhausts. I once built an exhaust collector to run outside the garage in winter so I could keep the roll-up door closed for comfort, and the steel Mk1 clamp-on collector attached to the muffler tips MELTED SOLDER on some of the parts. I had to repeat the whole fabrication using braze.
It won't do most of you any good but my exhaust hangers are fabricated from a test slab of rocket-motor case insulation of silicon-reinforced EPDM (ethylene-propylene-diamine) rubber, good for 650 F before it chars; it does not melt.
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