No you don't ..... The rear brakes hardly do any work on a car unless it's 4x4 ?
Yes they look amazing but it's totally over kill

I've gone through 4 sets of front pads & two pairs of rotors & still have my original Ds3000s on the rear with Tarox drilled discs that look new
I'm aware your all running massive power but having bigger rears won't make any difference to your braking unless you adjust the rear with a bios valve to start Drifting