That's a pretty intense wheel size man. I'm guessing you are going to be getting into some fender work if you haven't reached that point already. Invest in a fender roller. It's a couple hundred for a good one but learning to do it yourself is pretty fun and you can definitely make your money back on the tool loaning it to people or helping them do their cars next.
You can take a grinder and shave your rear fenders pretty easily and then use flap discs to smooth the edge and seal it with RTV sealant or something similar after. It makes it a lot easier to pull and flare the rears once they are flat if you needed a little more space. I just had to flare one of my rears to fit my new tires. Yea, just one side. How weird is that?
http://9thcivic.com/forum/threads/my-hellaslow-build.7842/page-4#post-233822
post 74 onward. He's tested 10" +18
the last few pages of his thread he changes wheels yet again to some other aggressive setups. You're going to be poking with 10.5 if you compare to his setup above