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Back to the wrap
Do Swedes Rap? Ok, seriously, holding the heat within the header is not a bad thing. It will dissapate down the pipe and finally exit. Not holding the heat can be a problem for short hops on the bike. A product of combustion is water. Exhaust water can be acidic. The water will condense inside the pipe and, if the pipe does not heat up fully, stay inside the pipe. The water will rust out the pipe - inside-out. This happens frequently in automibiles.
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