No. The main problem is the standard R53 discs and caliper pistons are too small. Brakes are all about leverage (disc size) and force (piston size). No amount of grooves or holes will make up for lack of either.I can get drilled and vented discs for between £50 to £100 for brembo and £70 for yellows. I am assuming that the reason for the poor high speed braking is because the kinetic energy generated has no where to dissipate so you have to overcome this by either using more force ie-bigger piston force or allowing the energy to pass through the discs ie- drilled discs.
Take a look on the link to Mod A Mini that I posted earlier in the thread. All you will need extra is the front discs and pads. I chose to buy new discs and pads for the rear.Probably best to go with the r56 ones then, so I gather I need calipers,discs, pads, carriers, brake lines
I have only ever heard that drilled brakes are just for show,
Vented discs do a much better job at cooling due to air being passed over the whole surface continuously where as all drilled brakes do is remove surface area for the pads to work effectively reducing braking performance.