Are the R33 GTST calipers bigger than the stock Z32 ones?

Yes IIRC the fronts are 310mm, they might be 300mm?, but certainly bigger than the Z32's 280mm.

Must be from a GTST though, the GTS are no bigger than the Z.

Yeah but I wouldn't bother. They arnt going to be good enough for track use and the discs etc are more expensive. If you want bigger brakes for a functional reason you need proper brakes, if you want to improve your brakes for road driving fix your stock ones, they are pretty good at normal road speeds.

r33 are 296mm. r34 are 310mm.

they are an improvement for sure

Arnt these 296 discs and calipers the same as 32 gtr ,because if they are my mate has had them on his 350 hp s13 drift car and they have stood up to lots of high speed braking and he's done loads of track day too .with no fade at all .

Thanks, Just looking to improve performance for road use. Compared to my old 350Z with Brembos the stock 300zx ones are poor. Plus the stock discs look a little lost on 18/19 inch rims.