I was very happy with the tune and other service I received from guys at AWDTuning in DFW. You can find my results
here from the Tuning section, but these results are quite comparable with what I've seen from SpecialityZ guys which is my benchmark. This was also on a Mustang dyno. Moreover, I had this done before my weekend at track where car performed flawlessly and have had no issues since. Finally, although this shop is mostly Evos and Suburus, Keith told me that he has tuned close to 100 Zs both NA and FI.