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NX Lightning solenoids feature an improved flow path that allows nitrous / fuel to enter above the seat and exit out the bottom for flow unmatched by any other solenoid on the market. Lightning nitrous solenoids feature an integrated purge port which allows you to connect a purge valve directly to the body of the nitrous solenoid. Purging through the body of the solenoid eliminates the air pocket between the purge valve and the solenoid orifice. Lightning fuel solenoids feature a fuel bypass port which allows you to connect a small return line to the tank. This eliminates trapped air between the fuel pressure regulator and the fuel solenoid which eliminates the lean spike associated with other solenoids. Lightning Series solenoids feature CNC aluminum bodies topped with Carbon Fiber cans for the ultimate in weight savings. Nitrous Express only uses the highest quality, made in the USA components in its solenoids. Do not be fooled by low price come-ons, the solenoids are the most important component of a nitrous system.This system includes: 8 of the NX VXL (extended length) Nozzles 2 NX Lightning series nitrous solenoids 2 NX Lightning series fuel solenoids Anodized aluminum distribution blocks 3/16 stainless hard lines Nickel plated fittings Jetting for 200-500HP 6AN nitrous feed lines High flow 6AN Y-fitting Wide open throttle switch 40 Amp relays and relay harnesses Master arming switch Stainless bottle brackets and a 10lb nitrous bottle with the NX Lightning bottle valve