What does an exhaust wrap do?

What does an exhaust wrap do?

THE FACTS: Header wraps are designed to keep the heat in the header to improve scavenging of the cylinders. Keeping the heat in the header allows theexhaust speed to remain high. (the right idea) Header wraps, by keeping the heatin the header, also reduces the radiant heat in the engine bay.
Previous article How to wrap your motorcycle exhaust ?
Next article Fire Sleeve