I was on ebay the other day and saw a power adder for corvettes C4, C5 and C5 Z06. It is a little knob with 2 wires coming out of the box behind it that replaces the air temperature sensor. Suposedly it adds 22 horsepower when you set the knob to the power setting. It also has a fuel mileage setting. I am guessing it jst tells the computer that the air is a different temperature so i get more fuel and air. Anybody ever heard of this? and is it safe to use? the company guaruntee's it not to damage the car....but im still a little leary. 22 HP for 30 bucks sounds a little iffy to me.