Jeff, the article states that both are complete kits that will fit on virtually any 4-stroke ATV. It doesn't mention 2-stroke engines, but doe's mention that both virtually have no back pressure. I wouldn't think you'd want any extra back pressure with a 2-stroke, but then again their both certified with USDA approved spark arrestors, which couldn't hurt in fire prone areas. So I cant really answer your question, but here are their links.
Benz Silent Rider $149 complete
http://www.atvsilencer.comATV Stealth Exhaust $199, guard is I believe $35 extra!
Believe it's a little larger also.
http://www.atvstealthexhaust.comPhil