Well if he's in the US and is an AMA flyer, he can't have an afterburner - not an actual one anyway...

However, it sounds like he's not from the US, and his mentioning of a "wire" leads me to believe that he's talking about afterburner lights.

With afterburner lights, they need to go between the inner and outer pipes, if it is a double-walled pipe, and if not, obviously around the outside of the single pipe. There should be as much clearance as possible between the inner pipe and the light ring, so that air can flow between them and help keep the light ring from picking up the heat from the inner pipe. The LEDs on the light ring also generate a lot of heat on their own, so you should have as much cooling air flow as you can get on the ring as possible. I would also route the power wires from the light ring away from the pipe as early as possible - which means making a small hole in the outer pipe to get them to the outside. Make sure that the wires are well protected where they pass through the outer pipe wall...

Bob