This top-of-the-line unit can be programmed to control both the amount of nitrous that is flowed to the engine (from 0-100%) and the time desired to ''ramp up'' from first hit to full flow. For example, you can program the controller to flow 25% of the nitrous 1.5 seconds into the run and increase to 75% at 5.3 seconds. Or it can go all the way to 100% much sooner. This enable a racer to fine tune the power curve of an engine to best utilize prevailing conditions. One of the most sophisticated progressive nitrous controllers on the market yet, very easy to use, each function is set through simply turning a series of dials to the desired position and pushing a ''program'' button.Note: Part #741-0050 Safety Application Kit required on all wet manifold EFI and Carbureted kits. (Not required on dry manifold kits).