The parts we were waiting on came back from the machine shop and we were able to complete the exhaust installation. The headers sound great with the cat-back; angry outside of the car while reasonable inside the cabin. The piping is 2.5″ through and everything is connected with v-band clamps.
You can click the video for a higher quality version.
A buddy of mine brought this to my attention the other day! It seems the February Eurotuner has a few paragraphs on the car. 
Last weekend I paid Thunderhill Raceway a visit with the Audi Club of Golden Gate…wow, what an awesome track! Since my car wasn’t ready, I decided to rent a Spec Miata for the weekend. and this was one of the best decisions I’ve ever made. I was able to refine my braking and vehicle control techniques over the two days at the track. The first day was split 50/50 with the first half was braking and vehicle dynamics mixed up with on track sessions; the second day was entirely track time.
Honestly, I can say I’ve learned more with seat time in the Miata than I would have in my S4.
My instructor and I.
This was my second session on the track with a Civic spinning out in front of me.
This was my third session on the first day.
Here is my third session on the second day. I shot this video with my 7D and my SD GoPro.
Here are three different videos of the car testing various exhaust options.
These two videos are of the JHM headers with the GMG resonated midsection, there are no mufflers attached.
This video shows what the car sounds like with only the JHM headers.