friend of mine recently brought his FLHX over to show off, and i noticed most of his exhaust has been wrapped UNDER the heat shields,does this help reduce rattling or heat?

 

it could reduce heat experienced by the rider, maybe

the concept of a wrap is to insulate the headers- hot exhaust gasses have a higher velocity through the exhaust tract, which is good for power.
if exhaust gasses cool, they contract and will slow.

same concept behind ceramic ( or other) header coatings.

wrap has a few downsides, it can look like crap- it can hold moisture to teh headers and rust can result


mike

 

cause your headers to rot out.