So the copper tube is wound around the exhaust itself or is it in front of the exhaust inside an extension of the muffler or both? The suit I saw had one insulated garden size hose on the umbilical that went into the back of the suit and branched off to four smaller hoses that looked like surgical tubing. From the ends of the surgical tubing there were smaller tubes like the type you see pumping air in fish tanks. They had tubes that ran all the way down to the feet and hands.