Nitrous Express 20939-15 Billet LT4 Supercharger Lid Nitrous System with 15lb Bottle

The Nitrous Express 20939-15 is a complete direct port nitrous system engineered specifically for GM LT4 supercharged engines. This system features a precision-machined billet aluminum supercharger lid that replaces the factory upper lid for a seamless, integrated installation.

Key Features:

• CNC-machined from solid billet aluminum for maximum strength and durability
• Direct port injection design delivers nitrous and fuel directly into each cylinder from inside the supercharger
• Single stage system with jetting for 100-300 wheel horsepower gains
• Includes complete 15lb nitrous bottle for extended use
• 1/8 NPT ports machined directly into the lid for easy expansion and customization
• Water/methanol injection ready—pre-configured ports allow easy addition of direct port water/meth systems
• Direct replacement for factory LT4 supercharger upper lid on all GM LT4 applications
• Eliminates the need for manifold removal or complex plumbing—nitrous is injected from within the supercharger

This system provides true direct port distribution without the complexity of traditional setups. The integrated design ensures even cylinder-to-cylinder distribution while maintaining the clean factory appearance of your engine bay. Perfect for street or track applications where reliable power gains and professional fitment are essential.