If you can stretch just a bit further go for AP Racing Calipers and rotors, they are the best. To stop the cossie properly you will need 6 pots at the front with 356 rotors. The rear can be fitted with 300mm rotors and bells, retaining the original caliper because of the handbrake

AP have got a new 6 pot caliper, the CP7040 which is the bees knees.

I messed around with 330mm and four pots, but never got the stopping power needed with 450+ BHP.

Godspeed supply the above, but Ian is a tad slow at shipping, his quality is very good with not too much messing around fitting.

Michael