Pretty like the term states. To fit a 10.5 or higher you have to pull the fender lips out to fit it. It's not impossible to fit. There's a member that did it years ago. The biggest to fit without major work is a 10. Even still you have to have the right offset. Check my stance acquired thread for my cl. I got a bunch of different wheel setups and specs.
the most i would go is 10 in the rear with a 225/40 tire. 10.5 you need to pull fenders. for offsets i need to look at my old CL build thread. i have a nsx now so ive kind of forgot a lot of CL info i knew. i used to run 18x9 and 18x10 on my CL.