So I've been looking at a 2011 yfz450x, a 2015 can am 450x xc, and a 2008 ktm 450xc and can't decide which to buy for xc/ gncc racing and need help deciding?

 

They all will work, and work well. From a strictly parts and support standpoint it is hard to beat the Yamaha. The can am is the most race ready if there are no aftermarket parts on any of them. Some one may want to argue that point vs the ktm, but that is my experience. Oh, and I love the ktm, wish they were still making them.