The quadzilla will be a much better tuner. Whoever said that extreme pressure thing is blowing smoke up your butt. Thats a complete and utter lie. And logically it doesn't make any sense. the cp3 can only make so much pressre. The injectors can take any pressure that the cp3 can make without a single issue.
But in short, yes, you'll be very happy with a stealth 2. They're great tuners for the money. Let me know if I can help! We've got them ready to ship
-Jesse