I just bought and installed the new Moose radiator guards on my 06 450. I am happy with them, they seem very strong and were fairly easy to install. The directions say to drain coolant but of course I tried to install them without draining it. The right side no problem, the left I had to unhook the big hose that goes down the back side and spilled a little. Maybe if I just had leaned the bike to the right I would have been fine, or just follow the directions and drain it. The guards went together nice and look cool. The white louvers fit fine with black dowels on top and bottom that say Moose racing on them. The only negative is replacing the shrouds. With the guard installed it adds a ¼ inch on each side and pushes out the shrouds. They come with a spacer and longer bolts for the bottom but the shroud still had to be stretched to line up the rest of the bolts, not bad though. You could trim the shrouds some to make them fit better.(I didn't) All said and done they seem very solid and I would buy them again. Some places had them on backorder, I found them at Midwestmoto (Ebay) $84.95 and free shipping. I got them in two days.