The gasoline Stage 1 Boost Cooler N/A™ kit is available for naturally aspirated applications that don't utilize a MAF sensor. Operation is very simple, the system starts injecting when the vacuum switch reaches the user-adjustable point and it injects a fixed amount of fluid through the nozzle until the switch opens again. This makes it a good choice for naturally aspirated cars looking for an octane enhancement and cooler intake charge. Activation can also be set up through any other user-chosen switch, such as a full throttle switch, etc. Now with Lifetime Warranty - please see details.