I just bought a 1988 SP200 and was wondering if anyone knew of a company that makes an aftermarket exhaust or slip-on muffler for it? I rejetted the carb (main jet up to a 140 from 122.5 per the forum's suggestion) and drilled the air box for better flow, but want to complete the mods with a more free flowing exhaust. Both the 1986-88 DR and SP 200 share common exhausts but finding and aftermarket application for either has been a headache. The current DR200se also shares this muffler. I located a used muffler to de-baffle (ie: long piece of rebar and a hammer) but it was $125! Any thoughts would be helpful. Thanks!