Did the InMotion upgrade with their "ByteShooter" and my laptop, no big deal, James is great to work with, certainly a good price.

As for the results, with my MB V8 airbox, K&N's, and Magnaflow, the ECU upgrade opened it all up - it drives smoother, even some passengers have remarked that it is not as rough or strained in the upper rpm's, and the extra torque is noticeable, and useful, down as low as 2000.

Only downside: Phoenix gas SUCKS - I mix some 100 octane racing unleaded in and the car just sings !!! Same on the stock RS4 and some friends' similar cars...104 octane boost helps in the summer, but now the carwash that just opened at the corner by my office has the 100 octane, and it's addictive...and it's only $6.50 a gallon (ouch)...they may have 104 octane soon they said, but I'm afraid to ask the price...