I had mine done by Joel at Power Chips.

The service was great and I am very happy with the results. Yes, it is a bit more that some of these other "back of their garage tuners" but wouldn't you really rather deal with a company that does this as their business not a side job for extra cash. You spent $30,000 on this car, no time to cheap out now. My motto has always been " you get what you pay for".
This is so true in everything (including strippers, but that's another story).

Joel is great. No worries there.