At the Corby Glen Sheep Fair at the weekend I was asked over and over why I had a tea towel stuffed up the exhaust (except for one veteran kit car enthusiast who immediately recognised it was designed to increase back pressure. He said he usually used a potato but it dried out and fell out ). And there were dire warnings about it catching fire. So I decided I should do something a bit more presentable, while still leaving it removable so I can test the emissions with and without it. Having said that, when I pulled the tea towel out it was just carbonised at the end with no real sign of heat.
So I bought some stainless steel scouring pads and pushed them tightly
up the pipe, then made a 'plug' by drilling a hole in a piece of wood
and using the part that was punched out. A bolt through the hole
should allow me to remove it when required.
Looks much smarter. Probably will still get the questions though