The part #'s for the stock pipes are different from the Pred to the Sportsman. From the pics I've looked at they look the same though. I'm gonna say they will interchange. The best advise though is to call someone that is more of an expert like WRH(Billy Holt) or Hetrick Racing(Rich Hetrick). I will bet they can tell you for sure.
Kevin
"You gotta pin it to win it!"
08 Raptor 250SE #21
08 DRX2 50 (stock) #22
04 Pred 90 (stock)
04 1/2 Sportsman 500
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Special Thanks to: Colsch Cycle "woodsracer22" (engine builder)