RobDon said:I had drilled Brembo discs for a while and even after a few trackdays there were no signs of cracking at all, I've had 2-piece Tarox drilled on the rears for 2 years and 4 trackdays, zero cracking.
The whole cracking thing is a bit of a myth, unless the discs are really cheap and nasty, but then what do you expect. You'd have to hammer the sh*t out of them constantly to make good quality drilled discs crack - i.e. trackdays every weekend. Porsche, Aston Martin, etc. wouldn't use drilled discs if they just fell apart as easily as some people suggest.
I've seen some monster Supras, Skylines, etc. with drilled discs, as long as they are a reputable make such as Brembo, AP, Stoptech, etc. then they should be totally fine for everything other than constant track abuse.
That Bremtech site looks pretty crappy with lots of incorrect info - I wouldn't buy brake discs from there - your life depends on your brakes, don't skimp on them!!!
Brembo drilled disks can crack, same as AP, same as Porsche...
When you see race cars running them also consider they also bin them after a race.