I installed 11.5" shocks without any problems with clearance.  My swing arm bearing were a little stiff with old grease and the swing arm had to be pushed down vs. dropping down with gravity but everything worked fine.

I have the stock rear wheel, belt, and use the stock tire size.

The extra travel is wonderful because my back couldn't handle the frequent bottoming out of the stock shocks.  Also it steers a little quicker with the raised rear end which I think is an improvement.  In terms of appearance there is no noticeable change.