I would do the test pipe and any other parts you want before the cobb tuner. The off the shelf tunes are nice but a custom tune is just that much better. I see you live in the Ville and Automotions is an awsome place to get a custom tune.
I am getting the race tuner put on the speed 3 June 1st. The shop I am going to is a cobb dealer and also work on Audis. Fingers crossed for over 300 whp.