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I'm with you on the bullet shape. My old Gio quad had that in the stock muffler, which I cannibalized for my XL250S project a few years ago. In that case, I measured the area of the exhaust inlet and calculated how many 1/4" holes would be needed to equal the total area (I then drilled a couple more for good measure). I was quite pleased with the results, since the original Honda exhaust had gone to its reward several years earlier.
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Weldangrind
"I figure I'm well-prepared for coping with a bike that comes from the factory with unresolved issues and that rewards the self-reliant owner." - Buccaneer
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