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Direct-Port Nitrous for EFI

Looking for the most bang for your buck? Try on a direct port nitrous kit for your late model EFI motor. Although a bit more complex and pricey than a traditional plate or fogger kit, the benifits of direct-port nitrous kits are well worth it in the end.

Photography by Henry De Los Santos
Direct Port Nitrous Efi Fuel Rail Relocation Brackets
Installing the NXL system is easy, straightforward, and requires very little time. Route the nitrous feed line from the rear of the car, and then start by removing the upper manifold, fuel rails, and injectors. Since the NXL nozzles need to be placed into the manifold injector bosses, you'll find that the fuel injectors will rest slightly higher. To correctly seat the fuel rail onto its new position, start by securing the lower bolts of the relocation bracket (red circle) to the manifold.
Direct Port Nitrous Efi Fuel Rail Relocation Brackets
Installing the NXL system is easy, straightforward, and requires very little time. Route t

Engine Specs


Heads: Factory cast iron E7TE, 1.72/1.46-inch intake/exhaust valves

Cam: Crane Cams hydraulic roller, 220/220 degrees duration at 0.050-inch lift, 0.498/0.498-inch lift

Induction: GMS 80mm mass air meter, Accufab 65mm throttle body, Ford Cobra upper and lower, ACCEL 24-pound injectors

Piston: Stock forged aluminum

Rods: Stock

Crank: Stock

Exhaust: 15⁄8-inch shorty FRPP headers, 21⁄2-inch cat-pipe and tubing





  • Direct Port Nitrous Efi Spacer Install
    Next, place the supplied billet aluminum spacer onto the lower manifold for added clearance, gently press the fuel rail onto the injectors, and mount the nitrous and fuel-distribution block on the forward most lower manifold bolt on the passenger side.
    Direct Port Nitrous Efi Spacer Install
    Next, place the supplied billet aluminum spacer onto the lower manifold for added clearanc
  • Direct Port Nitrous Efi Line Install
    Finally, insert both the nitrous and fuel jets in the proper housing (NX suggests starting with the smallest horsepower setting) and begin attaching the corresponding Teflon line to the nozzles (red for fuel and blue for nitrous). The Teflon lines are precut from NX for a precise fit, so be sure to lay them out initially before attempting to secure them.
    Direct Port Nitrous Efi Line Install
    Finally, insert both the nitrous and fuel jets in the proper housing (NX suggests starting
  • Direct Port Nitrous Efi Small Cap Conversion
    The factory's large-diameter TFI distributor caps interfere with the new location of the fuel rails. Anticipating this, the NX kit offers a small-cap conversion kit (call for specific applications) that replaces the lower wide-body spacer with a small-diameter performance cap with special billet clamps.
    Direct Port Nitrous Efi Small Cap Conversion
    The factory's large-diameter TFI distributor caps interfere with the new location of the f
  • Direct Port Nitrous Efi AN 4 Braided Line
    Attach the supplied "short" AN-4 line to the factory's Schrader valve to supply the additional fuel to the distribution block. Finally, connect both the fuel and nitrous feed line into the distribution block. That's it!
    Direct Port Nitrous Efi AN 4 Braided Line
    Attach the supplied "short" AN-4 line to the factory's Schrader valve to supply the additi
  • Direct Port Nitrous Efi Purge Cowl Mount
    We mounted the purge solenoid under the factory cowling as it allowed us to route the purge tube directly out of the plastic cowling with a simple 90-degree bend.
    Direct Port Nitrous Efi Purge Cowl Mount
    We mounted the purge solenoid under the factory cowling as it allowed us to route the purg
  • Direct Port Nitrous Efi NX Switchpanel Wiring
    Wiring a nitrous system is usually simple, but when trying to integrate a multitude of accessories including a purge, a bottle heater, and an automatic bottle opener, it can quickly get complicated. So rather than independently feeding and grounding each component, we wired everything though NX's "optional" control panel. The panel simplified the wiring, reduced any potential fire hazard, and it fit snugly into the factory center console.
    Direct Port Nitrous Efi NX Switchpanel Wiring
    Wiring a nitrous system is usually simple, but when trying to integrate a multitude of acc
Direct Port Nitrous Efi NX Switchpanel Complete
The three-button control panel features five separate functions. Pressing button A to the left activates the bottle heater, while pressing the button to the right arms the system. Button B is the momentary switch for the purge. Button C opens the bottle when pressed to the left and closes the bottle when pressed to the right. It's ergonomically friendly, extremely functional, and we especially like its inconspicuous design.
Direct Port Nitrous Efi NX Switchpanel Complete
The three-button control panel features five separate functions. Pressing button A to the

Hot Tips for Peak Nitrous Performance


- Always read the manufacturer's instructions

- Make sure you have an adequate fuel system

- Use a bottle heater to maintain proper bottle pressure between 900 and 1,050 psi

- Install non-platinum spark plugs one to two heat ranges colder than stock. Platinum plugs create a smaller flame and the spark can easily get blown out.

- Only engage the nitrous system at wide-open throttle

- Never engage the nitrous system below 2,000 rpm

- Prevent contaminants from entering the nitrous and fuel lines during jet changes by having clean hands and a clean work area

- Only use premium fuel with a fuel additive like NX's Chemical X (PN 16003)

- Use quality plug wires and an aftermarket ignition with 150-plus-horsepower nitrous shots


By Henry De Los Santos
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