Hi Chris_,
Based on my experience with my SC-Project, which has a similar configuration as the D200, heat would not be too much of an issue. Not to mention the D200 seemed to have more heat shielding near the rear cylinder manifold.
On my bike, the most heat came from the area near the rear cylinder manifold. I am sure since you are using it a the track, the rest of the pipe under the seat will also be quite hot, but you will be moving fast, so the air will extract the heat away enough.
There are several companies I believe offer mounting solution for the D200, but I only recall 1 right now which is Rizoma and here is the link:
Fox license plate support kit (for Termignoni® under-tail exhaust)
Regarding tuning, there are many tuning companies that can provide a tune for you for this exhaust, and it might be more comprehensive than the T800 solution.
Please refer to the thread:
DUCATI ECU and BBS Tuning (Racing EVO) for aftermarket exhaust which was created and started by our resident expert in ECU
@ggok