Can't say I can tell the heat resistance but it's probably because the big bore part of my kit gets hotter than usual but it's so easy a caveman could do it , but be careful lol, WEAR GLOVES LIKE MASSION GLOVES AND LONG SLEEVES BECAUSE FIBERGLASS sticks to you and washing with water will only make it worse! Oh and if you do need to replace your muffler I would recommend getting a new thermal wrap as the heat will cause the fiberglass to melt after use and smoke on the second use your first few rides!
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