The J&S SafeGuard harnesses the power of the microprocessor to allow your modified high output engine to run normal ignition advance for optimum responsiveness. Since the SafeGuard is a closed-loop control system using modern knock sensors as a feedback mechanism you no longer have to turn dash mounted knobs, twist distributors, or even second guess the future with a PC programmable device. Hundreds of times per second your J&S Safeguard will both monitor and adjust your engine's ignition timing on a cylinder by cylinder basis. If you think you can twist a dash mounted knob to retard the timing in cylinder number four at eight pounds of boost with a coolant temperature of "x" at 6385 rpm on a day where the temperature is 92 degrees farenheit and the relative humidity is "y" and the car is in third gear on a 6% grade at 1600 feet altitude....well, you're first in line for the next Superman movie. You probably "get" the idea, it would sure be a lot easier to let the microprocesor retard cylinder number four a very specific two degrees, six degrees or whatever and leave the driving to us.