Wont do much for your vehicle. They work well for high compression NA vehicles that may have issues with pinging or running on lower quality fuel. I knew a guy that had a 70 Cougar with a modded 351C in it that ran one of these simply because he was running 11:1CR with iron heads. It was tuned well, but hot days and certain inclines would make it ping like a ****. The water injection was used to curtail the pinging.
Our vehicles do not need that. With the advent of knock sensors and whatnot, the computer will compensate and prevent the sort of occurance that this kit is designed to do.
2009 Ranger Sport - 4.0L/Auto 3.55 Limited slip. Black. 2500K Nokya fogs, Vanish cover, PreKey Leveling kit and 4 cupholders!
1994 Mustang GT - 5spd
1969 Mercury Cougar -in progress 428 swap! Guessing low 12s?