I was looking into 6 piston brembo kits and they are all pretty expensive. I was thinking about a budget option, would the front breaks from a ceyanne gts fit on a 996tt with 19" wheels. I'm thinking about doing a stage 3 600hp build and need to upgrade the front breaks but I don't want to spend $3k-$5 on 6 pistons.

 

No. Different caliper mounting layout. The cayenne are mounted with tabs versus radial stud mounted like ours. While it is possible and often that people use our calipers with an adapter bracket to make work on tab mount applications, the reverse is not possible.

 

Those look like calipers from a new cayanne. Would it work with a ceyanne from around the same years as the 996? I don't know much about ceyannes btw so they might not have had 6 pistons back then.

 

All the cayennes are flange/tab mount type.

 

Just get spacers between hub and OEM calipers F&R, 350mm discs from 997 turbo, decent pads and proper fluid and call it a day.

OR...

...you can follow my path...997 Cup front uprights, 991 GT3 calipers and 380mm discs F&R. Plus racing pads and fluid.

 

Are you tracking this car? If not the 350mm upgrade, as noted above, would be just fine for 600HP IMO.

 

I'm planning on it.
I found a brembo kit that has 355mm rotors but replacement brembo rotrs are pretty pricey. Could you use 350mm rotors?

 

I have the Brembo 355mm GT kit on my car. it works really well. I however did not need to pay for it as it was on the car when i purchased it.