woah, this thread is so way off topic...
Scott- The fiberglass can be obtain in any motorcycle parts place that has dirt bike stuff. I got mine from Fun Bike Center. The cost can vary. You can also use steel wool. But results will differ from mine. The reason you cant just use the original stuff is because they are just baffles. its big hunk of welded up stuff thats really heavy. If you want to talk about weight savings the modified can is around 7 lbs or less. The stock is around 12lbs or so.
PM me if you have any more questions. or get at me on AIM, SN = H8Dninja250r
Go Go Kawasaki Go!