ZEX Dry Nitrous Systems incorporate the patented Active Fuel Control, which monitors the nitrous bottle pressure andadjusts fuel enrichment to achieve the perfect mixture. This ensures your engine will never run too rich or too lean when youengage the nitrous system. ZEX nitrous activates at wide open throttle using an electronic switch that monitors yourengine?s TPS sensor. The design ensures that your nitrous is engaged at the perfect wide open throttle position every time.The design of the ZEX Dry Nitrous System makes it a simple and easy two hour installation. This system includes everything that our normal dry nitrous kit contains but without the bottle. This system includes everything that our normal dry nitrous kit contains but without the bottle. Designed to work safely on many fuel injected, naturally aspirated,return style fuel system engines