I changed mine from a stock 52.5 to a 52.5 with holes. There isn't much difference, except when I turn on an intersection, before it was kinda hard to be easy on the gas when there was sand or grit in the turn, or when it was wet. I often wound up twitching the rear wheel unintentionally, because between 0-1/8 throttle the power set in kinda rude, like an on/off switch. I found this makes me pretty uneasy, as I didn't wanna lay it down. With the other jet with holes, it is better. The power sets in more smooth, and no more twitching the rear. Now don't get me wrong, I ride hard and both my pegs have lost quiet some weight on the bottom, but that felt to me like I wasn't in control, no matter how easy I tried to be on the throttle. It is NOT the same. There was a thread on here that was talking about that the pilot jets with holes are supposed to exactly do just that. Having a smoother transition.

That's strange. You're a mile high, and I am at 700ft. I put in a 55 pilot and was waaay too rich.