Just so you guys are aware, if you mod your ECU, and the dealer straight up asks you if you have aftermarket software and you say "no" and try to get warranty work done on any drivetrain components, that is Fraud - straight up. If they do determine you have software through one means or another, and catch you, you can be in some serious legal trouble.
Now, if they DON'T ask you...
I plan on getting flashed next year after I get about 15k or so on the car, so any drivetrain gremlins will make themselves known first. I figure if something is going to go, it's most likely to go early on due to a manufacturing defect, or right after the warranty expires - that middle bit is all gravy.