True, but is one that never got in the way. That part of the header would get very hot due to the cat located in the first part of the muffler near your ankle.
A slip on or opening up the oem muffler made it a lot cooler.
If anything, it adds a little protection to the sender unit from the header to the ecu.
"I reckon it would be good getting a heap of XR's in the one spot and watching a heap of blokes kicking fuck out of there bikes and swearing."