I recently picked up a 2010 YZ450F. I believe MX bikes make great offroad bikes, with a few mods. That being said I am slowly building mine for some riding in G.W.N.F. this spring. I haven't built one for offroad riding before, I usually ride as is. I thought it would be cool and informative to start a thread where everyone that trail rides a YZ can post their bikes and list the mods. So far I have an IMS 2.4 gallon tank, 2006 WR450 pivot link (for lowering), and trimmed seat.