Hi,
I have an SLR silencer box on my car that has become too noisy. The plan was to cut off the outer skin and make the box repackable by installing a nice aluminium outer sleeve in place of the stainless steel sleeve. I cut off the old sleeve using metal cutting discs in my angle grinder, no problem. When opened up I was surprised at the construction of the box and hence my query. The outer skin was made up of two layers of 2mm thick rolled stainless steel sheet spot welded together. The ends of the box were of a double skin design with a 10mm gap between and the box was filled with rolled stainless steel wire wool. Now I am puzzled why Cheesmans who make the exhaust systems for caterham went to all that trouble constructing the box in this way? it would seem they wanted to make it as heavy as possible. Why double up on materials and why have an 10mm void between the double skin on the ends of the box.
BTW the box had abviously become noisy due to the build up of carbon within the stainless wool in the silencer as non of this packing had burnt away or deterorated. The carbon had reduced the sound absorption properties of the ss wool.
Rob.