I had the same probs with the Thermal R&D stealth exhaust and I tried using leather and it just burned right though. I traded the exhaust to a friend with a coupe and he had the same problems and ended up taking it to a shop and having a custom piece made for it and now it's fine.
It's going to cost a few bucks but you'll end up spending the same amount of money of countless $15 fixes that don't really work and only last for a few days or a week.
good luck
Sean
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