I have run this set up on several street cars and never had an issue with ABS problems on GT3's or GT2 for that matter.. Including our own GT2.

 

I know of a few GT3's that have abs issues with a tall tire like that...it's realy bad, undrivable...it goes into what we call ice mode...maybe it works with some cars...but that's a realy tall tire about an inch taller..it must kill the gearing as well...making the car lazy.

The Kumho V710 is a great tire.

 

Lazy and GT3 are two words rarely used together...

Again, never had an issue- 10+ cars- Various drivers, various tracks and various conditions-

 

My car has been regeard...On the way home from the track I ran my friends GT3 on a roll I had a 26"+ tall tire (the only time)he is running the MPSC 235/295 and we go at it at speed and we are about even..who ever hits it first was quicker...kind of strange.. So we get back home from the track I switch to my second set of wheels with the MPSC 235/295, now he's feeling good that we were about even on a roll and I am little bit worried that I could not pull him.

Well all I can say is I just drove away from him...big difference...the tall tire made my car lazy!

When I ran the shorter Kumho 285 on the rear it had more jump..alot more.