my 2010 850 xp will be going thuogh some changes over the next 3-4 weeks.i am trying to build a true mud machine,i have installed the power commander 5 with auto tune kit,the exhaust was built by neils power pipes and has a sound unlike any other quad out there,32 inch silverbacks have been ordered on vision rims,along with rad relocation kit,2.5 inch rubberdown customs a arm lift,and a few other goodies from paul at rubberdown,his rad kit looks amazing.also srorkit from triangle atv,the clutch kit is from quad shop customs and comes with custom helixshould have the build done over the next 3-4 weeks when done i will post some pictures,also making custom grill cover ,any body have any ideas or some thing i should add on or maybe even change:d