You actually can get them turned. I called and talked to the technician at DBA and he explained how to do it. It requires a sharp bit, a shallow cut and a slow turn but it can be done. Takes two to three times as long to do one rotor the right way. I was surprised to hear that but it came from the horse's mouth so to speak. Now, in general I don't turn rotors regardless of their type; I've just always found that turned rotors warp easier and scuff easier. My DBA rotors lasted well past 75K miles with no warpage or issues whatsoever. Then I just replaced them with the slotted only style. DBA rotors are excellent IMO /IME.They are pretty damn good upgrades. But, you can't get them turned....ever.
Something else was wrong then; no way they would warp within such a short mileage. The studs were pressed wrong or something was wrong with the calipers or the system somewhere but this has nothing to do with the rotors.FWIW - DBA slotted rotors warped on my FJ-62 inside of a couple thousand miles. When I originally installed them I had the studs pressed in and the shop that pressed the studs in checked them for runout before they gave them back to me. Never overheated them either (per their painted heat indicators). I am running TLC4x4 Monster calipers and upgraded pads but I doubt that had anything to do with it. I had them turned and they're doing better but I'm not holding my breath.
The holes are good if you are running metallic pads since they both cool the pads and the rotors while promoting even wear of both the pads and and the rotors.My only complaint is the dirt collecting in all the holes.. if you ever run through lots of muddy water you will collect dirt in them too. I have "re-drilled" mine with a cordless drill a couple of times, which leaves a little pile of sand under each one, and all that can't be good for the pads, etc. My next set will be slotted only, fwiw.
My experience as well as other published tests do not support that testimony.On an 80 series, I don't think your stopping power will get any better than OEM rotors and 100 series pads.