I didn't see the Yamaha of Troy's 426 at Pontiac SX yesterday, but I did see their 250's. I didn't see anything special on the right=hand side except the header pipe. It looks like they're running something like the FMF powerbomb headers. I also saw Ferry's bike, but don't remember the exhaust valve system. Come to think of it, only the right side was visible from my side. both bikes sure sounded great out on the track!
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Mark
'01 YZ250F,'01 Yzinger 80,'99 WR400F,'99 XR100
'98 Royal Star TC,'96 XR200