Lol, how many do you have now?
As c10 said the lighter axles help the suspension function with less weight...but I agree that it's Alot to spend on a small return.
But, this bike is his toy, and he likes to throw parts at it just because.
I also like to play with it, wrenching and riding, and it's free to me, so it's a win win...but I still can't talk him into the Pro-Grip 761's, lol.
He's been talking about taking off the full M4 and replacing it with their full titanium version soon too, I think it's 6 lbs less than the one on it now, or an Akropovic if they have a full ti with cf muffler, we'll see.