To protect the leg and improve scavenging of the exhaust port due to the higher and more even temperature.
The pipes don't stay damp enough to corrode, it's not like a car where they are sat underneath.
@Ant started
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To protect the leg and improve scavenging of the exhaust port due to the higher and more even temperature.
The pipes don't stay damp enough to corrode, it's not like a car where they are sat underneath.