I've been playing around with cars and motors since I was knee-high to a sinister midget and I was recently given a tool (by a kind forum member) that I had not owned previously. I wanted to share with the other members because I was so pleased to finally have one; as seen in most shops it is the heat resistant (proof) exhaust hose. I always had to open the door and run a fan whenever I did not want to asphyxiate myself and others when tuning an engine. With this contraption I was able to run my coupe for close to half an hour with the A/C on (in the building) and no fumes at all in the shop. Again, not really an unique discovery but now that I have one I don't understand how I got by without it and I would encourage anyone else to get one. They're really easy to use 
