RJKflyer

On the 997.2, the GT3 appears to have better discs than the TT ('floating' plus hat etc.).

Curious as to why the difference? (I understand why that design is preferable, but why don't we get them on the TT?)

Are they interchangeable? I'm assuming so as i think Brembo do a 'Type III' upgrade that appears to imply suitable for both cars.

Anyone either (a) used GT3 discs, and/or (b) tried the Brembo?