Paul the calipers are standard, not many have a big 60mm piston to push the pad with.

Looked at 4 pots and without touching anything else i'd be 20% worse off on the cross sectional area.

On the last event we did, Tim Finch came over to have a look around the car as he was surprised we were running just outside the top 10 and couldn't believe we were only on std brakes lol.

I tried DS series pads but they didnt work too well for me - left too much copper on the surface of the disc