Pushing more tire to the outer part of the car will also help with grip, which will negate the increase in the marginal unsprung weight increase... so, yes, it'll be noticeable on track -- in a good way.End point is any difference is not noticeable unless you're on a track.
Eurocompulsion sells em:4) The new bolts are great, but I wished the bolts were black, just like the original ones. Maybe I can find some bolt covers.
You're thinking of the hub, but it won't be a problem. Their spacers are hub centric, which is why they cost 5x more than your generic wheel spacer that generally aren't.the 5mm in the front slide pretty much over the axle, but the 17mm in the back kind of replace the part of the axle that the wheel goes on