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Just to go back to the exhaust (sorry I've been distracted by house renovation), when I designed my silencers (?!) I tried out a principle that I had read about in some trade literature possibly for Fox exhausts. Anyway the basic idea was that you can achieve some degree of silencing by having the exhaust gases travel through a suddenly increased cross section prior to exiting. So in my case I modeled the silencers on reverse cone megas, with the first cone being a muffler, and the reverse cone being a void of increased section prior to exiting a hole the same diameter as the inner muffler tube. There are no baffle plates or any form labyrinth system, just straight through. The result is questionable but they seem to me to be reasonably quiet at low revs, coming on song at about 4 to 5k when they might be quite loud.
Just thought this might be of interest to others designing their own exhaust.
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Bitza
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