If you're in the Austin area and are interested in an ECU tune, please give UpRev a call about coming in. They are looking for stock cars so they can compile data on them in person. I have submitted a ROM dump of my ECU, they've done some simple tunes. But to truly extract the power of the VK56VD we need someone in Texas to drive down to UpRev and have them dyno the car, rummage through the ECU and see what they can do to unleash its full potential.
With a motor this large and boasting direct injection, we are definitely leaving a ton of power on the table. I have a light UpRev tune on my car with stock exhaust, and my tuner was able to extract 40WTQ in parts of the low rev-band (2000-3000RPM) and about 10-15WHP. With some breathing mods and with UpRev possessing better hands-on knowledge of our ECUs, we can easily get more power than that.
http://uprev.com/secure/
10200 N Lamar Blvd #202, Austin, TX 78753
(512) 821-9848