A lot of people say with the flat face rpf1 on a +45 offset 9 inches wide you will barely have any brake clearance. I purchased some anyway, hoping to get away with some 3 mm spacers.
I drive a 9-2x aero with a wilwood 4 pot bbk upfront. My rpf1's came in the mail today and I'd like to say I had plenty of clearance WITHOUT a spacer. The wilwoods stick out a half inch from the wheel mating surface of the hat.
I'm not saying these will clear brembos, I know that they stick out a lot but perhaps with a small spacer they will.
Great thing is these are becoming less rare in 5x100 thanks to the brz/fr-s (which is what these will be going on in the fall along with a wilwood 4 pot kit!)
For those interested tires are nexen n7000 235/40's