Check with HVC Cycle, as I recall they are the last of the big two stroke shops on the net. Moto Carrera was another, but they deal with a lot of RDs. They build custom systems though, and they are worth every penny.
Parts are still available. For chambers, contact John Easton at JEMCO in TX. I'm sure he's the only guy making a set for the 550.
Another web site worth visiting is Sundial http://www.suzuki2strokes.com/forum/ Quite a few 550 owners over there including a really nice red bike belonging to Coyote.
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