GRS will be fine at that boost, a charge cooler wouldnt tho

Brakes : IMO you would be better with Goodridge braided hoses all round. you will need dot 5.1 or AP600 fluid in it. Std brake fluid will boil under track conditions and give you a soft pedal or feel like its fadeing. I would also change the front discs to a grooved or a groved and drilled something like Tarox or Padgid NOT EBC! but you dont need to go any bigger in size then the std RST size if you dont want to, or you could go the 2wd drive saff dront disc conversion route.

Pad wise i would fit either Mintex 1155's or Ferodo 2500 pads again NOT EBC greens!!!

rear discs will be fine

I run dot5.1 fluid, goodridge hoses and Tarox grooved and drilled discs and mintex 1144 pads, they do a great job on track, but i keep cracking the 1144 pads with too much heat. Im gonna try Ferodo 2500 pads next

Forgot to say, check you wheelbearing/hub nuts are done up properly and hammered in at the indent part so they cant come undone! mine did on the last bedford day and with very little warning i lost 90% of my braking with excess brake pedal travel, and i was lucky not to lose a wheel off the car. Track days are hard on everthing but esp brakes, suspension and wheelbearings