My Exige had EP ali belled discs on it when i bought it and it was a great improvement over the standard discs that were on my elise before it. (same pads too)
‘Thirded’. Although, my rear discs will need replacing very soon, so I’m likely to stick my 295 APs on the back, and get the biggest possible ones for the front.
Even on standard calipers, braking is much improved, and the discs last much longer.
As far as I know the rear is limited by the standard Brembo - to 280 - the front can be up to 308 using Alcon (or AP) rotors.
I have a pair of special rear bells and AP rotors to suit standard rear calipers if anyone wants them as I have upgraded to Motorsport uprights with 295 rotors and 2 pot rears with a spot handbrake caliper.