I bought a 2006 WR450 last April. Going from a 2004 Drz 400 and after doing all the unplugging I really like how this bike performs. After riding spring, summer and fall I'm ready to do some upgrades. Has anyone installed a Scary Fast Racing powernow or Scary Fast Racing powershot. All the articles I have read the feedback is positive. Magazines say they are both worth the money. If anyone has installed any of these products, where did you feel the difference in performance. We ride mostly trails and fast fire roads here in Michigan. Thanks in advance for any feedback.