I watched a video on youtube because I was interested in it. They had a 350 nova and installed it. Then they did a baseline without it and then with it. It made 4rwhp extra. So for just 4 hp I'll save my 300 to 600 bucks.
That is because without pressurizing the intake charge the temperature of it stays reasonable, once you pressurize it the temp goes up alot. I should plug my scanner into my truck and drive it to see what it does. You can build a home brewed water/meth injection kit for alot less than that...