Nitrous Express Lightning Nitrous Solenoid Stage 6 (Up to 300 HP)NX Lightning Series solenoids feature CNC aluminum bodies topped with Carbon Fiber cans for the ultimate in weight savings. Each solenoid has a purge or bypass port built in, and a bottom exit for flow unmatched by any other solenoid on the market. Nitrous Express only uses the highest quality, made in the USA, solenoids on its systems. Don't be fooled by low price come ons, the solenoids are the most important component of a nitrous system.