1. First of all: you don't have to buy bigger wheels... that's what i should do... (and done...)
2. If you can read well, you can see that it's possible to config the big brake kit. You can also go for the normal upgrade kit, or the same diameter...
3. The question about the master cylinder and abs pump, i just refer you to the basic physics...
4. If you want, you can config you 6 front and 4 rear piston calipers... (like Brembo... or are they also 'unnecessary overkill' ?¿)
5. If you are a track racer, you should be more worried about your original brakes than quibbling about ultra high performance brakes...

Thank you!

Tom