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just a little reasoning behind exhaust wraps from autospeed.com they seem to realize the benefits of high exhaust velocity:
High Energy Exhaust Wrap is woven from the finest insulating materials available, and can withstand temperatures in excess of 600 degrees Celsius. When wrapped around engine exhaust pipes, the High Energy Wrap can reduce under bonnet temperatures by as much as 80%, preventing heat related damage and helping to increase horsepower by reducing intake temperatures. High Energy Exhaust Wrap keeps the exhaust heat inside your exhaust pipes to maintain exhaust gas velocity, increasing combustion chamber scavenging and therefore horsepower.
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