NX Lightning solenoids feature a raised inlet and bottom exit which eliminate up to three 90 degree turns and one expansion area in the body of the solenoid. The result is more horsepower! Lightning solenoids are CNC machined from lightweight billet aluminum and topped with true carbon fiber cans for the ultimate in weight savings and beauty. Lightning series nitrous solenoids feature a bypass port which allows you to connect a purge valve directly to the body of the nitrous solenoid or a small bypass/return line to your fuel tank. This feature eliminates lean spikes caused by air trapped between the fuel pressure regulator and the fuel solenoid. Nitrous Express only uses the highest quality, made in the USA solenoid components.