Figured I would drop a line as I am a DC area 5th gen LGT owner (2010).
Bought the car earlier this month. Picked up the Cobb AP (came in the mail today) and look forward to uploading the stage 1 map shortly.
Don't know how far I will be looking to take the car with regard to tuning, but will probably end up doing a Pro Tune at some point. I have been calling Mach V on and off (they are literally up the street from me) and asking them questions about parts and pieces for the car. So far they have been responsive and great to deal with. Very helpful for a newbie (me).
Looking forward to seeing what you end up doing and where you go.