Juan, I track my car too and changed the front calipers to GT3 6-pot calipers and use the 350mm Turbo rotor. You have to use the 350 turbo rotor and not the 997.1 gt3 rotor due to the offset difference. If you change the part called....uprights....to the gt3 up right then you can use the gt3 rotor.

This change made a nice difference on the track and even emergency stops on the street. The next step is to change out the rear to the GT3 caliper and 350mm rotor too.

Hope this helps!

 

These 911 brakes are the best brakes I've ever had on any car and really impressed me during the few times I desperately needed the car to stop!

Tom

 

Thank's that's the way to go!!