Could you please help me with this, I've researched the polaris website and found that on my 2011 800 6x6 ranger that I have 40 hp. But , on a ranger sportsman 850 xp it has 70hp , I no that the 850 is a little larger but why is there such a differance? Also has any one asked polaris that since they have a motor that will put out 70 hp , why in the world would'nt they put it in the rangers 4x4 / 6x6 or even the rzr? I no that the 850 sits in the sportsman sideways , but if I made it work in my ranger would all the wiring ( ecm ) work in my ranger? If it is not possible to put the 850 in my ranger could I buy every item that is made for a 800 engine to gain the most hp and get to 70hp, if so I'll just go with all the upgrades? I no that I have a lot of questions , but I would really appreciate the help , due to I'm wanting all the hp I can get to turn 29.5 tires on my 6x6 but still have the reliability. thanks to all.