I have an 02 XR50R for my son that I am trying to get him one more year out of. He is getting a little tall for it but not big enough to switch up to a 110 yet. I was thinking of putting a tall seat on it and possibly a rev box to give him a little more power. Are the rev boxes worth getting for a stock motor? What are some good brands for tall seats? I have seen a few on Amazon for $35ish and the BBR for $100. Is the BBR seat really worth 3x the price? Anything else I should look at?