I have a set of 2-piece front rotors that I ran on my B7 A4 2.0T Quattro for roughly a year. I pulled them before I sold the car. The brake cooling these rotors provide is phenomenal. If you have any brake fade or overheating issues, this is the best solution I found.
I originally purchased them from ECS.
The rotor hats are reusable with new rotor rings and mounting hardware. The rotors have some wear on them, but only have ~12k miles on them, so they should be good for quite a while yet. Roughly 75 miles have been on track.
Here are some pictures. I quickly wiped them down with some brake cleaner, so there are a few smudges on the rotor face still. (Sorry, these are not show car rotors, I used these for driving!! )
Price: $350 Shipped
Shipping includes the lower 48 states. Other locations we can negotiate.