why on earth would you need bigger than 326mm? its a 1200kg car...unless your aiming for something like 800hp+ i strongly reccomend u keep ur current upgrade...put that extra money into something else!
My car will do mainly track work, and its only getting 330mm's MAX...
'Cos I got them at a good price, and the reality is that the car will do some cct work at Mallala, and that is one of the hardest cct's on brakes in Australia.
Also, I plan to do some laps in the Adelaide hills, and I don't want to run out of brakes !!!