I did this mod a couple weeks ago. Thanks OZ for the pics and write up it was helpfull. I guess my expectations of the 15T was a little high, the front gets alittle lighter on hard exeleration and I pulled a little power wheely on my first try, but I don't know its ok. As for the speedohealer I...
I found shifting anywhere over 5-6k smoother. It did take a little time getting used to the " its about to blow sound " but now I do most of my riding around 6-8k with an ocational up to near redline then its like warp speed:D
Enjoy and ride safe.