Sorry, after reading this I realized it was a bit misleading as far as the context. I was wondering if anyone had successful dropped down to 16s for road course. I know that the IS/Altezza platform is a little hefty so brake upgrade limit wheel sizes but figuring the few that stay with the stock setup (17"). I have been contemplating going down a size to decrease rotational mass and possibly increase a little acceleration, I know some of factory wheels came as a 16. If you did what specs were you able to go with, were there any noticable differences in the change.