i'm not sure any improvement in performance would be big enough to make much difference. It will feel faster, coz it sounds better.
anything that lets it breath easier can only be good though.
I can sympathise on the spanner front, i'm hopeless. I discovered many years ago that every time i open a toolbox i cost myself more money than i'm trying to save. Each to his own for me. I'll be good at what i do, and someone who's good at their job can work on my bike.
Some people seem to think you're not a real biker unless you can fix em. They can say it to my face, if they can catch me, but i doubt it. :d
this is what it looked like before it ate it's own gearbox. While it was off the road for the rebuild i accumulated a few bits and ideas for it.
It'll be different again when it comes back out.