Accessories

Boost Your Ride's Potential With A Nitrous Express Proton Kit

Discover the Nitrous Express Proton Series for affordable horsepower. We review features, installation, and several different Nitrous Kits.

Todd Bandel

08 Feb 2026 • 13 min read

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If you’ve ever felt the need for speed, the kind that pins you to the back of your seat and makes your heart race, then you know that stock performance just doesn’t cut it. Every gearhead eventually hits a plateau where simple bolt-ons aren’t delivering the thrill they used to. You want more power, but you also want reliability, affordability, and a system that won’t require a PhD in engineering to install.

Designed for those who crave serious performance gains without breaking the bank, the Proton Series is a series nitrous system that has become a favorite among street racers and track enthusiasts alike. Whether you’re driving a muscle car, a tuner, or a daily driver that needs a little extra kick, these nitrous systems offer a potent solution.

In this comprehensive guide, we’ll dive deep into what makes the Proton Series special, explore the different models available, and show you exactly why this upgrade might be the best investment you make for your vehicle. The Nitrous Express Proton Kit is available for purchase from multiple retailers, including Summit Racing and Amazon.

What makes the Proton Series different?

When you decide to put a bottle under your hood, you have three main expectations: you want to go fast, you need extreme durability, and you want good value. The Nitrous Express Proton Series was engineered specifically to hit this trifecta.

Unlike older, bulkier systems that clutter your engine bay with tangled wires and mismatched solenoids, the Proton Series combines high performance into a compact, all-in-one module. This isn’t just about aesthetics; it’s about efficiency and longevity. Nitrous Express is a reputable manufacturer known for producing high-quality, domestically made components, and choosing a product from a trusted manufacturer is essential for ensuring both quality and reliability.

High-quality manufacturing ensures reliable operation and performance under high-pressure conditions.

Serious Performance Improvement

At the heart of any nitrous system is the promise of power. The Proton Series delivers this in spades. These systems are capable of producing up to 150 horsepower to the wheels. The kit includes a number of jetting options, specifically, jets for 35HP, 50HP, 75HP, 100HP, 125HP, and 150HP, giving you a number of possible horsepower increases to match your needs.

With the optional SHO jet kit, the Nitrous Express Proton Kit is capable of producing up to 250 horsepower to the wheels. That is a massive jump in performance that transforms how your vehicle accelerates, passes, and launches. Whether you are looking for a modest 35 hp bump for street driving or the full 150 hp shot for the drag strip, the included jetting allows you to tailor the power to your specific needs.

Durability and Reliability

Heat is the enemy of performance electronics. Nitrous Express tackled this issue head-on with the Proton's design. The solenoids are encased in a black anodized aluminum housing. This housing looks sleek, but its primary function is thermal management.

It effectively pulls heat away from the solenoids, ensuring they operate reliably even under the stress of high-performance driving. This extreme durability means you get consistent nitrous delivery pass after pass, without the worry of solenoid failure.

Ease of Installation

One of the biggest barriers to nitrous adoption is the installation process. The Proton Series simplifies this with its “module” design. Because the solenoids are combined into a single unit, mounting is straightforward.

During installation, the process of loading the nitrous system components is streamlined, making configuration and readiness easier. The systems come as a complete kit, meaning every nut, bolt, and electrical connector needed to complete the installation is in the box. You won’t need to make mid-project trips to the hardware store or scour the internet for missing fittings.

Customer feedback on installing the Nitrous Express Proton Kit is mixed. Some users find the installation easy, while others report it can take about 3 hours to complete. Several customers have experienced missing parts and installation issues. The instructions could be clearer, especially regarding the hosing layout part, and some users have reported confusion with the wiring diagrams.

A Closer Look at the Proton Plus Series Nitrous Models

Nitrous Express offers several variations within the Proton line to suit different vehicle layouts and driver preferences. Each kit typically includes essential items such as a nitrous bottle (usually 10 lb or 15 lb), jets, activation methods, and necessary installation hardware.

The system generally comes with a 10 lb or 15 lb bottle and includes jets that can add between 35 and 150+ horsepower, with some versions capable of up to 250 horsepower with optional jetting. While they all share the same high-quality solenoid module, the differences lie in the bottle size and activation methods.

Here is a breakdown of the specific models to help you decide which one fits your build.

Nitrous Express Proton Plus Series Nitrous Systems 20421-10

Nitrous Oxide System, Proton, Wet, 35, 50, 75, 100, 125, 150 hp, 10 lb Bottle, Microswitch Activation, Kit

Check Price on Summit Racing Equipment

Check Price on Amazon

NEX-20421-10: The Standard 10 lb Bottle Kit

This is the "gold standard" kit for most enthusiasts. The NEX-20421-10 comes with a 10 lb bottle, which offers a perfect balance between capacity and weight. It features the aluminum high-flow Lightning 45 bottle valve, ensuring that your system never starves for nitrous when you need it most.

Best for: Most street/strip cars where trunk space allows for a standard bottle.
Includes: Stainless bottle brackets, 10 lb white bottle, and microswitch activation.

Nitrous Express Proton Plus Series Nitrous Systems 20421-15

Nitrous Oxide, Proton, Wet, 35, 50, 75, 100, 125, 150 hp, 15 lb Bottle, Universal, Microswitch Activation, Kit

Check Price on Summit Racing Equipment

Check Price on Amazon

NEX-20421-15: Maximum Capacity

For those who want to make more runs between refills, the NEX-20421-15 is the answer. It includes a larger 15 lb bottle. This is ideal for serious racers who frequent the track and want to minimize downtime.

Best for: Heavy track users or vehicles with ample cargo space.
Includes: 15 lb bottle, stainless bottle brackets, and all standard Proton Plus features.

Nitrous Express Proton Plus Series Nitrous Systems 20421-05

Nitrous Oxide, Proton, Wet, 35, 50, 75, 100, 125, 150 hp, 5 lb Bottle, Universal, Microswitch Activation, Kit

Check Price on Summit Racing Equipment

Check Price on Amazon

NEX-20421-05: The Compact Solution

Space is at a premium in many modern sports compacts and motorcycles. The NEX-20421-05 solves this with a smaller 5 lb bottle. It is lightweight, easy to hide, and perfect for setups where a large bottle just won't fit.

Best for: Motorcycles, compact tuners, or "stealth" installs.
Includes: 5 lb bottle and the compact Proton module.

Nitrous Express Proton Series Nitrous Systems 20420-05

Nitrous Oxide System, Proton, Wet, 35, 50, 75 hp, 5 lb Bottle, Universal, Push-Button Activation, Kit

Check Price on Summit Racing Equipment

Check Price on Amazon

Nitrous Express Proton Series Nitrous Systems 20420-15

Nitrous Oxide System, Proton, Wet, 35, 50, 75 hp, 15 lb Bottle, Universal, Push-Button Activation, Kit

Check Price on Summit Racing Equipment

NEX-20420-05 and NEX-20420-15: Push-Button Activation

While the "Plus" series typically utilizes a microswitch (often attached to the throttle body for wide-open throttle activation), the NEX-20420 series offers push-button activation.

NEX-20420-05: Comes with a 5 lb bottle.
NEX-20420-15: Comes with a 15 lb bottle.
Why choose this? Push-button systems give the driver manual control over exactly when the nitrous engages, which is preferred in certain racing applications or for drivers who want total tactile control.

Installation: What to Expect

Installing a Proton system is designed to be a weekend project for a competent DIY mechanic. The Nitrous Express Proton kit is designed for almost all single-throttle body EFI vehicles and is compatible with progressive controllers for improved power management. Because the system includes stainless braided nozzle lines, a stainless fuel line, and an extra-long stainless braided feed line, you get high-quality plumbing right out of the box.

Here is a general overview of the process:

Mounting the Bottle: Secure the bottle brackets in your trunk or cargo area. Ensure the bottle is angled correctly so the siphon tube picks up liquid nitrous.
Mounting the Module: Find a spot in the engine bay for the black anodized aluminum housing. It needs to be within reach of the nozzle lines to the intake.
Plumbing: Connect the nozzle adapter and single shark nozzle (or Piranha nozzle for the 20420 series) to your air intake tube. The Proton kit is compatible with vehicles equipped with a single throttle body. Run the braided feed line from the bottle to the module, and the fuel line from your fuel source to the module.
Wiring: The kit includes a relay harness, a 40-amp relay, a master arming switch, and either a wide-open throttle switch or a push button. Follow the wiring diagram carefully. The master arming switch is usually in the cabin, so you can arm the system only when you are ready to race.
Jetting: Select the jets for your desired horsepower level (35, 50, 75, 100, 125, or 150) and install them into the nozzle. Note: The 20420 series is generally jetted for 35, 50, and 75 hp.

If you encounter installation issues or need to return the kit, be sure to include a completed Return Merchandise Authorization (RMA) form to facilitate processing.

Safety Note: Always disconnect the battery before doing electrical work, and ensure your engine is in good health before spraying nitrous.

Nitrous Systems and Safety

When it comes to nitrous systems, safety is just as important as performance. The Nitrous Express Proton Fly By Wire Nitrous Kit w/10lb Bottle is engineered with a suite of safety features that give you confidence every time you hit the switch. At the heart of the system is the master arming switch, which puts you in full control, arming or disarming the system as needed, so nitrous is only delivered when you want it. The included relay harness and 40-amp relay provide robust electrical control, helping to prevent malfunctions and ensuring reliable operation under demanding conditions.

Durability is another cornerstone of the Proton systems. The black anodized aluminum housing not only looks sharp but also pulls heat away from the solenoids, protecting them from the high temperatures that come with spirited driving. Stainless bottle brackets, stainless braided nozzle lines, and a stainless fuel line are all part of the package, offering extreme durability and resistance to corrosion. The braided stainless feed line ensures consistent nitrous delivery, while the aluminum high-flow Lightning 45 bottle valve eliminates bottlenecks, so your system is always ready to perform.

Designed for modern electronic fuel-injected vehicles, including those with fly-by-wire throttle bodies, this kit is as versatile as it is powerful. The system includes a single Shark nozzle and nozzle adapter for efficient nitrous flow, and the mount module makes installation straightforward, even for first-time installers. Every component is manufactured in the USA, reflecting Nitrous Express’s commitment to quality and reliability.

The Proton Fly By Wire Nitrous Kit is capable of producing up to 150 horsepower to the wheels, making it a serious upgrade for any performance enthusiast. The system includes everything you need for a complete installation, from the relay harness to the mounting hardware, so you can get up and running quickly. The TPS Autolearn wide-open throttle module adds another layer of safety, ensuring nitrous is only activated at the right moment.

For customers who demand a compact, high-quality, and complete nitrous system, the Nitrous Express Proton Series delivers on every front. With its focus on safety, durability, and performance, this kit is designed to meet and exceed your expectations, whether you’re looking to dominate at the track or simply add some extra excitement to your daily drive.

Real-World Applications

Who actually uses these kits? The versatility of the Proton Series means it shows up in a surprising variety of vehicles.

Electronic Fuel Injected Vehicles: The wet system design (injecting both fuel and nitrous) is perfect for modern EFI engines, preventing lean conditions that can destroy an engine.
Drag Racing: Weekend warriors use the 150 hp shot to shave seconds off their quarter-mile times.
Drifting: A quick 50-75 hp shot helps spool turbos faster or break the rear tires loose to initiate a drift.
Car Shows: The polished bottles and braided stainless lines look incredible under the hood and in the trunk, earning points for presentation.

Customer Feedback

The reputation of Nitrous Express is built on customer satisfaction. The Nitrous Express Proton Kit has been reviewed by many customers who find it to be a great starter kit that works well and offers good value for money. Users frequently praise the Proton Series for exceeding expectations regarding quality and price.

One customer noted, “I was skeptical about an ‘all-in-one’ unit, but the installation was seamless. The black module looks like a factory part under my hood, and the power delivery is instant.”

Another reviewer mentioned the value: “For the price, you cannot beat this kit. It comes with the Lightning 45 valve, which flows great, and having all the brackets and lines included saved me a ton of hassle.” Customers also note that the kit is a quality product that significantly enhances vehicle performance.

The consensus is clear: if you want a system that is capable of reliable performance without the custom order price tag, the Proton Series is a winner.

Why Choose the Nitrous Express Proton Series?

In a market flooded with performance parts, the Proton Series stands out for a few key reasons:

Made in the USA: Quality control is paramount. These systems are assembled with pride in the USA.
Complete Kit: You aren’t just buying a solenoid; you’re buying a solution. From the master arming switch to the nozzle adapter, it’s all there.
Value: It offers high-end features, like the aluminum housing and stainless lines, at a price point that makes nitrous accessible to more enthusiasts.
Versatility: With jetting options from 35 to 150 hp, the system grows with you. You can start small while you learn the ropes and jet up as you build your engine to handle more power.

Please note that some nitrous oxide parts, including certain Proton Series kits, may not be legal for use in California or other states with similar emissions regulations. Customers should check local laws before purchasing.

Ready to Feel the Rush

If you are ready to transform your vehicle into a street machine capable of producing serious horsepower, the Nitrous Express Proton Series is the upgrade you’ve been waiting for. Don’t settle for being second best at the stoplight or the track.

They currently have these kits in stock and ready to ship. Whether you need the standard 10 lb kit or the compact 5 lb version, you can click the add to cart button today and expect fast shipping. Shipping costs are calculated at checkout, and the checkout process is designed to be seamless for your convenience.

International orders are welcome! Please note that you can only cancel your order before it has shipped or before tracking information has been provided. Once your order has shipped or tracking information is available, it cannot be canceled. If you need to make changes after shipping, please initiate a return or RMA as needed.

Visit their shop page to view the full specifications. If you have questions about fitment or jetting, their team is ready to help. Submit your order now and get ready to experience the power of Nitrous Express.

Thank you for reading!

Your friend,

Todd

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