Congrats on the new Milltek system. Those results are right in the range of what other members have seen from their systems I believe. Good numbers.
After much deliberation I am going to pair the Milltek headers with the AWE Catback

Two great products that have produced excellent returns when combined, and the AWE sound is more to my liking over the Milltek sound...just a little louder and more aggressive.
Your report on the GIAC flash was interesting, and reconfirms my decision not to get the engine flashed due to poor results from the NA motor.