DaveC. Go out and check out the Brute Force 650i. It has IRS and a few engine mods when compared to the BF 650(non IRS). I has different heads, bigger cards, and a hotter CDI, different tranny gears (It is a CVT but there are gears)wile still staying bullet proof. This will give you 6 horsepower and much improved acceleration. There was a mag article where the brute force 650i out accelerated all the big bores except the Outlander 800. I also like that it is not as big as the other big bore quads. I will look for the article and post it later. I'm getting mine in a couple weeks. Happy wheeling.