08 Chevy Silverado 1500 LTZ 6.0L V8

I was very happy and pleased about the performance of the aqua tune system in my truck. My horsepower went from 280 to about 320hp and on the highway my fuel mileage increased from an average of around 14 to an average of 18 mpg. And I could always tell when the system was out of water less horsepower and take off power, but all it took was dump in a gallon of distilled water and I had my horsepower and take off power back. Very pleased with the aqua tune units they pay for themselves.