He's full of it.
There is no way in hell you would gain more then a couple HP tops and you would need to run premium fuel all the time. Even a custom tuned chip is not going to net any where near 20 HP and it would be light years above the crappy stock SVT tune.
I find it downright hilarious that people try to swap to and even actually swap to an SVT PCM. The stock code sucks. They spend hundreds just to get a POS stock SVT tune. What a waste of money!!!
The X-cal2 chip is the best thing on the market right now. For $300-400 you get an okay preset tune and the ability to fine tune the important areas. For those that truly need it there is the racer package at $650-700 and you get full ability to tune.
Regardless of what PCM you are running it boils down to this. Your are tuned or your are NOT tuned; Period.
