Snow Performance’s big contribution to water injection is its computerized controllers. Besides taking the guesswork out of when and how much water to add the controller’s sophisticated, progressive water application avoids stuttering and bad driveability. For this test, a MAF Boost Cooler was mounted atop the fusebox. It gives variable control of the water injection based on mass airflow voltage. In other words, it accurately flows water relative to the engine’s airflow. Injection starts at 5,200 Hz of mass-air signal and is full on at 8,500 Hz; typical mass-air ranges are about 3,000 Hz at idle and 14,000 Hz at WOT. A #5 nozzle flowing 375 ml/min of Boost Juice (50/50 water/methanol) was used.