Exhaust systems in vehicles generate extremely high temperatures due to the combustion process happening within the engine. These high temperatures can easily exceed 1,000 degrees Fahrenheit (537 degrees Celsius) in certain parts of the exhaust system, especially near the engine and the catalytic converter.

Safety: Without insulation, nearby components or materials could be damaged or catch fire due to the extreme heat emitted by the exhaust system. Insulation helps contain the heat within the exhaust system, preventing it from spreading to other parts of the vehicle.

Performance: By keeping the exhaust gases hot as they exit the engine, insulation can help improve the efficiency of the catalytic converter. Catalytic converters work most effectively at high temperatures, so insulation helps maintain these temperatures even during periods of low engine load.

Comfort: Insulating the exhaust system helps prevent excessive heat from radiating into the passenger cabin or other areas of the vehicle where it could cause discomfort to passengers or occupants.