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ZEX Wet Injected Nitrous System (86-04 V8)

Item 30109
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      Review & Installation Video

      The Zex Wet Injected Nitrous System is for '86 to '04 V8's, and it's gonna be something that you should check out. If you are looking for affordable horse power hands from an easy to install complete nitrous kit that gives you a range of 75 to 125 horsepower jets for a stock or mildly modified car. This is designed to work with the stock fuel rails and the stock fuel system, so if you already have a lot of modifications you should really consider a fuel pump upgrade here because you are gonna wanna make sure that you are not gonna be starving your engine of fuel while you spraying.A lot of people say that nitrous offers you the best bang for your buck. If you are looking for a big horsepower increase there are a few different ways you can go with nitrous. This particular kit comes with 75, 100 and 125 jets. It's throttle position sensor activated and it's a wet system.This is a very comprehensive kit that comes with everything that you are gonna need for an easy, clean, and straight forward install that's well done with no corners cut. Gonna call this install a two out of three wrench in the difficulty meter since you do need some basic wiring knowledge to get it done. You can plan on spending about half a day in the garage.Before we really look at the specific kit further, I can start with a basic overview of a wet versus dry nitrous system just so you can make sure that a wet system like this one is gonna be the right choice for you. A wet nitrous system gets its fuel from a connection to the engines fuel system, in this case, it's gonna be the stock fuel rail. The fuel supply is directly fed to the nitrous nozzle. Now a dry nitrous system, on the other hand, injects the enrichment fuel or the additional fuel that you are gonna need to burn the extra oxygen that the nitrous is gonna give you through the engines own fuel injectors, not the nitrous nozzle. So looking at your jetting options right away with these kits since that's one of the main concerns here. This kit is gonna include 75 100 and 125 shot jets so you do a few different options when it comes to the jets but just so you know you can't go any lower than a 75 shot with this kit.Now if you are actually looking for something a little more than a 125 shot there are some other options like either of the nitrous express kits. Those options are gonna give you a 150 shot option. One thing that is different about this kit is that it includes a nitrous management unit. So the wet system connects to the fuel system and controls the amount of both fuel and nitrous through the management unit. Zex does this because they say that it helps to control the fuel atomization and ultimately the power that you are gonna gain. What's really nice about this is that the major components of this kit like the solenoid and the electronic throttle switch are contained in one enclosure which makes for a plug and play install. This means that you won't need a mounting bracket or you won't have to adjust the placement of your switch in order to make it work right since you won't be using a throttle arm activated micro switch. The way that this system works is through active fuel control that will automatically adjust to the nitrous fuel enrichment with bottle pressure. This is gonna help keep things safe when you are running nitrous and it's gonna give a little more engine protection.Now this system activates at wide open throttle, so the system is going to monitor the TPS voltage to make sure the nitrous is going to be introduced at the right time. You will have one wire that clips on to the TPS output voltage wire, and this is gonna read your TPS voltage signal and send it to a programmable electronic switch that then engages and disengages the system based off a predetermined voltage threshold. And when talking about fuel atomization, this system has an injector nozzle with a little bit of a different design. Two features of this nozzle are its fuel transfer tube and the fact that it's self-adjusting in a sense. The fuel transfer tube injects the enrichment fuel directly into the outer edge of the nitrous plume. The nitrous gas shields the fuel away from the tube atomizing it into a finer degree than other designs can. This technology helps with fuel distribution from cylinder to cylinder and ultimately offers a better engine protection. The transfer tube is also self-adjusting and meaning that it self-adjusts to the bottle pressure. The way that it works is that a vacuum is created as the nitrous is sprayed across the tube opening. As the bottle pressure goes up so does the gas speed and the vacuum level. The increase in vacuum pulls more fuel out of the nozzle which then helps to steer clear of going lean. Looking at the individual components of this kit, this is a big kit but it's gonna include everything that you need to get this installed. It's a 10-pound bottle but it will arrive to you emptied just so you guys know. You get your bottle clamps, the nitrous nozzle, your horse assemblies, fuel jets, a wiring harness, all of your hardware and fittings, and your switch cover.Like I said earlier this is system is used with the stock fuel rails and it needs fuel pressure to be at 40 psi. When it comes to price you can expect to play close to the $600 mark for this. A lot of people consider nitrous to be one of the best bang for your buck modifications when it comes to return on investment. How else can you add over 100 horsepower while only spending $600? Now the flip side of that is that it isn't a constant horsepower add but either way if you wanna compare the cost of this kit to your other options out there, this kit is less expensive. The nitrous express kits are a little bit more expensive but they do offer up to 150 shot if you are looking for a more than 125. Install wise this is a time-consuming instal but it's straight forward and not difficult as long as you can do some basic wiring. You will expect to spend about a half a day in the garage. I'm gonna call this a two out of three wrench in the difficulty meter. You are gonna need a handful of different tools and of course, wiring equipment as well so you can wire this up.I am gonna glaze over the details here just to give you guys an idea since we aren't going to show you guys a full instal, but there are step by step instructions that are gonna come with the kit. You will need to decide where to put everything. Mount the nitrous bottle, mount the nitrous delivery line under the car, mount the nitrous management unit, instal the nitrous nozzle, and wire everything up per the instructions. Once that is done you will need to program the activation switch, install the fuel delivery line, check both the fuel and the pressure lines, and check the fuel quality and ignition timing. Like I said it's just a basic overview, but that's what you are looking at instal wise. That's gonna wrap things up for the Zex Wet Injected Nitrous System for the '86 to '04 V8, and as always you can check out more online right here at

      Product Information

      Features, Description, Reviews, Q&A, Specs & Installation


      • Gain Up to 125 HP.
      • Advanced, Precise Electronic Controls.
      • Throttle Position Sensor Activated.
      • Works with Stock Fuel Rails.
      • Includes 75, 100, and 125 Jets.
      • Fits 86-04 V8 Mustangs.


      Gain Up to 125HP. ZEX Wet Injected Nitrous Systems include 75, 100, and 125 shot jets that will get your Pony flying down the track faster than you ever thought possible for less money than you'd believe. It doesn't get cheaper to add that much power to your Mustang.

      Advanced Electronic Control. ZEX's Wet Injected Nitrous system uses patented "Active Fuel Control" that automatically adjusts nitrous fuel enrichment with bottle pressure. The result is that your engine never runs too rich or too lean, preventing engine damage. Unlike other less expensive systems, the ZEX "Wet" nitrous systems activate at wide-open throttle using advanced electronics that monitor your engine's throttle position sensor voltage to ensure activation at precisely the right time. This makes using your nitrous system very easy and reliable.

      Better Nitrous Delivery. Unlike "dry" nitrous systems which inject nitrous directly, ZEX Wet Nitrous Systems connect to your fuel system and controls the amounts of fuel and nitrous using their management unit. The result is better control, complete fuel atomization, and more power.

      Application. This Zex Wet Injected Nitrous is designed for use on the 1986-2004 5.0 and 4.6 V8 Mustangs with the stock fuel rails. System requires a minimum fuel pressure of 40 PSI.

      Technical Notes. Professional Installation recommended. Requires fuel pressure of 40 PSI.

      Shipping Notes. This item ships ground only, expedite shipping is not available for this item

      Fitment: 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 Details

      MPN# 82023

      CA Residents: WARNING: Cancer and Reproductive Harm -


      Customer Reviews (37)

      Write a Review

      Ratings Summary

      4.9 out of 5 overall rating from 37 customers

      Installation Time: Afternoon

      • May 02, 2019

        5 1999 GT - Shotime99 Installation Time: Afternoon


        The zex wey kit is amazing it really gives the stock GTs that power they need in the higher gears. I recommend for any GT owner who needs power top end bang for your buck.

        Helpful (1)
      • April 26, 2019

        5 1989 GT - Cguess9212 Installation Time: Afternoon

        Zex kit

        Gained 4 mph and lost .5 seconds to the 60ft in the 1/8 mph with the 125 jets. Car pulls much harder if you can keep the tires hooked up in 1st and 2nd.

        Helpful (0)
      • April 06, 2019

        4 1988 GT - Charlie Installation Time: Afternoon

        Great kit im ordering

        I love it great power gains you tube (countryboy6767)

        Helpful (2)
      • April 05, 2019

        5 2001 Bullitt - Konnor Installation Time: Afternoon

        2001 bullitt

        Great product. Very easy and straight forward install.

        Helpful (0)
      • March 07, 2019

        5 1987 GT - Angelaguimir Installation Time: Afternoon

        100 Shot in my 87 Stang

        Very happy with nitrous ZEX!! Huge POWER diference only in 100 shot. There's some vídeos on youtube chanel(angelaguimir).

        Helpful (2)
      • February 12, 2019

        5 2003 Mach 1 - DouglasC Installation Time: Afternoon

        Easy install

        Got it fast really easy to install took me 2 hours I would recommend it.

        Helpful (1)
      • July 31, 2018

        5 2001 Bullitt - AdamB Installation Time: Afternoon

        Best bang for your buck.

        Pretty straight forward install. I went from running 13.8 with bolt ons and gears to running 12.3 on the 100 shot. Extremely happy with it. I would recommend getting a window switch and nitrous outlet fuel rail adapter.

        Helpful (5)
      • July 24, 2018

        1 2000 GT - JaylonA Installation Time: Afternoon

        Does not contain proper parts

        Fuel rail fitting is not the correct size for my 2000 gt and the inline fitting is also not the correct size as both are too large, kit did not include and wire to run an arming switch nor a switch. Not satisfied

        Helpful (5)
      • July 13, 2018

        5 1998 Cobra - GeorgeF Installation Time: Afternoon


        Great product for the price. Installation took a couple of hours with the help from your video. Everything you needed was included. Shipping was the fastest 24 hours. Americanmuscle is the best bang for your buck.

        Helpful (5)
      • May 09, 2018

        5 2002 GT - Cawbee Installation Time: Afternoon


        Kinda scary at first trying to figure out the instructions. But very simple once you start hooking up the line.

        Helpful (6)

      Questions & Answers (30 answers)

      5 Top Rated Questions

      safe for high mileage car Would it be safe to use this kit on a 03 mach 1 with 130,000 miles on it. I'd like to go faster but need my car for daily driving cant afford to rebuild a motor.

      • A properly maintained engine can handle the occasional weekend beating. Just as long as you don't use your "go-juice" every time your late to work....

      Helpful (3) Show 2 more answers

      is there anyway to convert the kit from throttle engaged to button? maybe instead of tapping the tps have the lead to a button?

      • A Button can be used for activation, but is not advised. We recommend TPS switched or a window switch.

      Helpful (1)

      So I'm new to the nitrous scene and this might seem like a dumb question. Does the bottle come filled or do I have to find a gas supply company locally to fill it for me?

      • Zex Nitrous Bottles are shipped empty and will need to be filled by the receiver.

      Helpful (0)

      Wet and dry ?

      • This would be a wet style system.

      Helpful (0)

      Is it safe to put it on a mustang gt 2001 stock ?

      • With a good tune, this would be okay to run low pressure yes.

      Helpful (0)
      10 More Questions
      Hi I own a 1998 mustang gt, my motor is a 4.6 v8 and it’s all stock, it has a pi head swap and I was wondering if this system Canrun a purge system ? And if so how would I set it up with this system, I am new to nitrous, and would a tuner from you guys work or would I use a timing light and do it myself. 1 answer
      its tune required? 1 answer
      with a 97 cobra 4.6 dohc with a 5 speed will the electronic management system shut the nitrous on and off when you shift gears. like when you let off to shift will it shut off then kick back in when you hit the throttle again. or do i need a window switch also. 1 answer
      I keep seeing you have to run 40lbs fuel pressure. How is this achieved? Do I need a new fuel pump? Add a regulator? Fuel pump voltage booster? What is the easiest and cheapest way to do this? My car is a 95 5.0 with just an SR CAI, headers, cat delete, flowmasters, and msd coil. I want to run 100 hp jets. Thanks. 1 answer
      can you run this on a 97 cobra 4.6 dohc with the 5 spd, without the window, also with a 5 spd do you want to shoot nitrous in every gear or can you just use it like in 4th gear on the top end. im new to this so want to set it up right and not have any issues. i was thinking a 75 or 100 shot max. 1 answer
      I have a 2004 mustang gt with a vortex v1 my car was dyno'd at 411 crank 360 rwhp the car has 410 gearing svt fuel pump 47lb ford racing injectors 78 mm throttle body. My question can I run a 75 shot zen wet system with a supercharger 1 answer
      I currently have this set up on my car. Just wondering if anyone has added a purge kit and how it would be done? 1 answer
      I have a Exedy Mach 350 stage 1 clutch in my 02 gt, with bolt ons. It is capable up to 430 lb ft of torque at the rear wheels, will a 100 shot put me over that and will I have to upgrade clutches? 1 answer
      Will this kit work with a carbeurated 302 ? 1 answer
      Can a window switch be used with this kit? 1 answer

      Installation & What's in the Box

      Installation Info

      What's in the Box

      Hardware included:
      • (1) Nitrous Management Unit
      • (1) 10 lb. Nitrous Supply Bottle (unfilled)
      • (1) Bottle Clamp (Short)
      • (1) Bottle Clamp (Long)
      • (2) Wet Nitrous Nozzle
      • (1) 24" -3AN Braid Hose Assembly
      • (1) 36" -4AN Hose Assembly
      • (1) 16' -4AN Braid Hose Assembly
      • (1) .026 N20 Fuel Jet
      • (1) .030 N20 Fuel Jet
      • (1) .034 N20 Fuel Jet
      • (1) .040 N20 Fuel Jet
      • (1) .046 N20 Fuel Jet
      • (1) .054 N20 Fuel Jet
      • (1) Arming Switch Wire Harness
      • (1) 10 ft. Red 18 Ga. Wire
      • (1) Switch Cover
      • (4) 5/16-18x1" Bolt
      • (4) 5/16-18 Nut
      • (4) 5/16 Flat Washer
      • (6) 8x1/2" Drill Tip/Phil Head
      • (1) 1/8-28 NPT Right Hand Tap
      • (1) 90 Degree -4AN Swivel Adapter
      • (1) 1/8 NPT Bulkhead Fitting
      • (1) Bulkhead Fitting Nut
      • (1) Fuel Tee Fitting
      • (1) -4AN to 1/8 NPT 90 Degree Fitting
      • (1) -4AN to 1/16 NPT Fitting
      • (1) Schrader Valve Core Tool
      • (2) Hose Clamp

      Tech Specs

      Nitrous Kit Specifications
      Year/Model:86-04 V8Manufacturer:Zex
      Wet or Dry:WetIncluded Jet Sizes:75-125
      Delivery System: NozzleBottle Size Included:10lbs

      Will It Fit My Mustang

      • Bullitt - 01
      • Cobra - 93, 94, 95, 96, 97, 98, 99, 00, 01, 03, 04
      • Cobra R - 93, 95, 00
      • GT - 87, 88, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99, 00, 01, 02, 03, 04
      • LX - 87, 88, 89, 90, 91, 92, 93
      • Mach 1 - 03, 04
      • Other - 86

      Fits V8's Only

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