I haven't, but I didn't want to anyway as I'm using the vents/apertures for brake cooling ducts.
If you want to keep the fog lights you will have to plan the pipe routing slightly differently, probably tighter into the chassis, not a
problem as long as you plan for that. If you look at my build thread, particularly where I've laid out the pipes out on the grass, it would mean bringing the 90 degree bends in tighter so that the overall piping diameter (side to side) is less if you see what I mean. It's the vertical part of the piping that fouls the back of the foglight..
It's the same with the black plastic recess in the bumper that houses the grills, foglights etc. Some people go gung ho with the piping then find they have to trim the back of this recess as they've routed the pipes where this should sit.
Again, it's not a
problem as long as you plan for it. It obviously adds time to the project as it requires lots of test fits of the bumper cover to make sure everything is lining up and clearing etc..