Like the title says has anyone thought about 16s on there si will it even fit only reason I ask is because I got offered 16x8 0offset ccw lookalikes any feed back helps thanks
You can definitely put 16s but the bore, bolt pattern and shape should fit the Si. If you go to a store they have 16s that fit the 2012 Si you need to check the details though in the case of your ccws. Bolt and Bore is easy, if they actually clear the calipers is the real important thing to check.
You will loose some of the road feedback and grip response will change but that is always the case with downsizing.
if they clear the brakes on the 8th Si, i'm pretty sure they'll fit on the 9th (at least brake clearance wise). as far fitting in the fenders, that i dunno.