No, the Cayenne appears to bolt from the inside of the caliper (side) and the GT3 bolts from the top.

Look at the photos on page 3 and compare them to the Cayenne.



However, I would like to know if these fit under the stock 996 wheels.

 

Thanks for the info. The Cayenne does bolt from the inside, we run them on the S4. I couldn't see the picture of the GT3 setup because it was blocked at work. Make sense, im sure if it was possible people would have done it already.

 

Do these 350mm brake setups fit stock 996 18" twists?

 

Yes they do, but just barely. Double check depending on which brand you choose. The 997TT rotors and the Girodisc rotors fit because I have used both under the stock wheels.

 

Front and back fit for sure?

Had someone tell me it would not fit with 18's.