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Good to know. Maybe this stuff is better suited for insulating air intake tubing instead.
Link is broken.
Anywho, exhaust wraps are good for high power applications like boost for example. It keeps the exhaust insulated so the gases flow faster and keeps the temps under the hood down. One downside though is that the extracters/dump pipe will rust quicker depending on what type of metal has been used.
Not sure about cars, but they're great for preventing rust on bike exhaust.