A buddy of mine runs TRMotorsport 18x9.5 front and 18x10 rear (with Nitto 275 tires) on his E46 M3 and came over to my place today to do a fit check on my car.
The 18x9.5 did not fit in the front. The inside of the rim hits the strut. We did not try them on the rear. In any case, spacers would definitely be required for the front with 18x9.5.
We installed the 18x10 and the fit seems fine. I drove with them a bit and could not feel or see any rubbing, even at full lock. The car has a stock setup, including camber. "BMW M Power Mexico" mentions some slight rubbing. This may be due to the 1.4 deg camber he is running.
I really like the wheels and will probably get them soon. I am still undecided whether I want to go 265 or 275. will probably go with 275 though.
BTW, big thanks for "BMW M Power Mexico" for a nice writeup. Very helpful.
Here is pic with the wheels on: