Is the master cylinder the same for all models? I was talking to the service dept and they said that there are three different sizes (bores) for the Z. The biggest size being 26.8mm.

If the master cylinder on the Track model is different from the Enthusiast and Performance model then how will the Stoptech 4wheel brake kit upgrade perform and feel on the enthusiast or performance model. Will the brake pedal feel as firm as the one in the track model?