Alright people, I'm looking for a little advice here. I have a '01 YZ 426 with a Dr. D exhaust and a 450 exhaust cam in it. It has all the power I need on tracks and trails, but I like to climb hills. That's where it comes up a little short in the power department and I also start to notice the extra weight. I want to do some competitive climbing this summer and would like to know if anyone thinks an early year YZ 450 would be a noticeable improvement? (I don't have enough money for a '06, more like a 2003 or 2004) I don't really want a 2-stroke (even a 500) because I like the low end torque on the low or no run-up hills. Thanks for the help in advance.