Nitrous Express 20421-15 Proton Plus Wet Nitrous System w/ 15 lb Bottle 35-150

Vehicle Fitment

• Universal - fits all gasoline-fueled electronic fuel injected (EFI) vehicles with a single throttle body

Fitment Notes

• Designed for single throttle body EFI applications - not for carbureted engines or multi-throttle body setups
• The single Shark nozzle installs into the air intake tube upstream of the throttle body
• For fly-by-wire (electronic throttle) applications, see PN: 20422-15 which includes the TPS Autolearn WOT module
• For the same system without a bottle see PN: 20421-00; with a 5 lb bottle see PN: 20421-05; with a 10 lb bottle see PN: 20421-10
• Upgradeable to 250 HP with the optional SHO jet kit (sold separately)
• Not CARB legal - not for sale or use in California
• Made in the USA

Features

• Wet system design injects both nitrous and fuel through a single Shark nozzle for a complete, self-contained power addition without altering factory fuel injectors
• Black anodized aluminum nitrous/fuel module housing pulls heat away from solenoids for extreme durability and consistent performance across repeated activations
• Compatible with progressive nitrous controllers for staged or ramped power delivery across the RPM range
• Includes jetting for 35, 50, 75, 100, 125, and 150 HP - six power levels covered out of the box with no additional purchases required
• 15 lb nitrous bottle with high-flow billet aluminum Lightning 45 bottle valve delivers maximum flow capacity for extended runs and higher power shots
• Stainless steel bottle brackets, 15-foot braided stainless feed line, and braided stainless nozzle lines provide a durable and clean installation
• Wide-open throttle microswitch ensures nitrous engages only at full throttle for safe, consistent activation
• Includes 40 amp relay, relay harness, master arming switch, and all necessary nuts, bolts, and electrical connectors for a complete installation

Specifications

• Part Number: 20421-15
• System Type: Wet - Single Nozzle
• Delivery Style: Air Intake Tube
• Nozzle Type: Single Shark Nozzle
• Fuel Type: Gasoline / EFI
• HP Range: 35-150 HP (standard jetting); up to 250 HP with optional SHO jet kit
• Included Jet Sizes: 35, 50, 75, 100, 125, 150 HP
• Bottle Size: 15 lb
• Bottle Valve: High-Flow Billet Aluminum Lightning 45
• Activation: Wide-Open Throttle Microswitch
• Feed Line: Extra-Long 15 ft Braided Stainless
• Module Housing: Black Anodized Aluminum
• Progressive Controller Compatible: Yes
• Country of Origin: USA

Included Components

• 1x Proton Plus Nitrous/Fuel Module (Black Anodized Aluminum)
• 1x 15 lb Nitrous Bottle w/ Lightning 45 High-Flow Billet Aluminum Bottle Valve
• 1x Set Stainless Bottle Brackets
• 1x Single Shark Nozzle
• 1x Nozzle Adapter
• 1x Set Stainless Braided Nozzle Lines
• 1x Extra-Long 15 ft Braided Stainless Feed Line
• 1x Stainless Fuel Line
• 1x Master Arming Switch
• 1x Wide-Open Throttle Microswitch
• 1x 40 Amp Relay
• 1x Relay Harness
• 1x Jet Kit (35, 50, 75, 100, 125, 150 HP)
• 1x Complete Hardware and Electrical Connector Kit

Product Description

The Nitrous Express 20421-15 is a complete Proton Plus wet nitrous system with a 15 lb bottle, engineered for gasoline-fueled EFI vehicles with a single throttle body. The system is built around NX's compact black anodized aluminum nitrous/fuel module, which injects nitrous and supplemental fuel simultaneously through a single Shark nozzle installed in the air intake tube. Jetting for six power levels - 35, 50, 75, 100, 125, and 150 HP - is included from the factory, and the module is compatible with progressive nitrous controllers for ramped or staged power delivery. With the optional SHO jet kit, output can be pushed to 250 HP.

The kit is complete from bottle to switch: the 15 lb nitrous bottle features NX's high-flow Lightning 45 billet aluminum bottle valve, stainless bottle brackets, and an extra-long 15-foot braided stainless feed line for flexible routing. A master arming switch, wide-open throttle microswitch, 40 amp relay, relay harness, and all necessary hardware and electrical connectors are included for a self-contained installation. Made in the USA. For fly-by-wire throttle applications, see PN: 20422-15.