Nitrous Express Lightning Nitrous Solenoid Pro-Power (Up to 500 HP) Engine Components>Intake Manifolds these fittings adapt a M20x1

these fittings adapt a M20x1

The purple aluminum cover is stiffer than a stamped cover and therefore allows a higher lever ratio to maintain the pedal efforts at a reasonable level

Liquid-filled for vibration resistance and durability

HKS 02-07 WRX / 04-07 STi Hiper Exhaust

Nitrous Express Lightning Nitrous Solenoid Pro-Power (Up to 500 HP) Engine Components>Intake Manifolds these fittings adapt a M20x1NX 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. Warranty