If you spoke to a kid at Tunerfest than you didn't speak to the owner, because I was outside finalizing all the ballots for the show....judging the car show (for most of the show).
Yes, the car is running stock engine management, because we ran through two different engine management that didn't work. One was a two extra injector setup that messed with the ecu and the stock injectors weren't working well with it and then a MAP sensor was tried (see Supra forums more info on this type of engine management).
The goal was to put AEM EMS On the car parallel, but this car has CAN Bus and Drive By Wire, so the new STI test would have helped with the CAN BUs feedback from AEM and the drive by wire was being worked in the new GTi I believe from what I remember (been a while now). Also, the time involved for this, would have been rediculous.
ALSO, did you look inside the car? Did you see any gauges in there, if so you would have seen the AEM Wideband gauge. Also, this is not my daily driver and recently the car has been in the shop for sometime awaiting sponsorship help. I went a different route with car and I have met a lot of people in the industry, which has helped me out with my fun car..2002 WRX (cheap deal - salage title).
I am now awaiting Unichip Enginement to control timing and fuel. Unfortunately there isn't a big backing for the Mazda 6y, because everyone backs out of products even though they ask for the parts (i.e. LSD - dozens of people interested, but only 2 people going forward with it).
If you want to see the car in the future, look for it at ImportFest maybe earlier; awaiting for products from a few companies. Also, perhaps go to Mazda6tech for more info on the car, I provide detailed information throughout that forum/thread (giving all information about it...search for my name if you want to see some info).
Edit..misunderstanding, no problem. Oh yeah I forgot to mention you talked to my friend and he has just begun leanring about FI applications (he is interested in the WOMP supercharger - he has a P5). He usually bullshits to some people about the car, but he respects Mazda people and wouldn't make things up (i.e. 400whp).