the fact that high end rotors are cast with holes in them is a rumor someone started long ago and now everyone thinks its fact. all "cross drilled" rotors are drilled.

rotors cracking is normal, its part of rotor wear. the main reason people (people that know, not regurgitating what they read somewhere else) advise against drilled rotors for track use is cause they crack/wear out faster. another reason is less surface area. old pads used to give off gasses under aggressive use, the original reason drilled rotors were invented was to provide a place for these gasses to go. but modern pads dont, so there is no reason for drilled rotors.

here is a non drilled cracked rotor:


here is a cracked drilled rotor:


the again, sometimes stuff like this happens (note the microcracking around all the holes)

 

I will make them if someone wants them...

 

Nice, I didn't know they made four-lug Evo rotors.