Need Speed: Nitrous Express MainLine Carbureted Nitrous Kits
Boost engine performance with Nitrous Express MainLine kits with the best wet systems for Holley, Q-Jet, and Dominator carbs at Summit Racing.
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If you are looking for the most cost-effective way to add massive horsepower to your vehicle, you have likely looked at turbochargers and superchargers. While effective, forced induction systems often require thousands of dollars and weeks of fabrication. There is a faster, simpler, and much more affordable alternative: a nitrous system. Nitrous Express systems are cost-effective compared to turbochargers or superchargers, often priced between $300 and $800 for basic kits.
For decades, nitrous oxide has been the go-to solution for drag racers and street performance enthusiasts who want instant power on demand. Among the many options on the market, the Nitrous Express MainLine Carbureted Nitrous Systems stand out as a premier choice for those who value performance over pretty packaging.
In this guide, we will explore why the MainLine series is the smart choice for budget-minded racers, break down the specific kits available, and help you look forward to choosing the right setup for your engine.
What Are Nitrous Oxide Systems?
Before we dive into the specific products, it helps to understand the basics. A nitrous system works by injecting nitrous oxide (N2O) into your engine's intake. When heated during combustion, the chemical bond breaks, releasing extra oxygen. This allows your engine to burn more fuel, which creates significantly more pressure in the cylinders and, consequently, more horsepower.
It is simple math: more oxygen plus more fuel equals more power.
Nitrous Express (often referred to as NX) has built a reputation for quality and innovation. Their MainLine systems are designed to strip away the "bling"—like chrome plating and fancy packaging—to focus strictly on what matters: delivering reliable, safe power at a price point that makes sense.
Overview of Nitrous Express MainLine Systems
The philosophy behind the MainLine series is straightforward. Nitrous Express recognized that many enthusiasts wanted the legendary performance of NX systems but didn’t want to pay for aesthetic upgrades they didn’t need. The result is the “MainLine.”
Nitrous Express offers a variety of nitrous systems, including the MainLine Carbureted Nitrous Systems and the Proton Plus Series Nitrous Systems. The Proton line, such as the Nitrous Express Proton Single Nozzle Nitrous Systems, is known for high performance and quality in automotive applications.
These kits are “wet” nitrous systems. A wet system injects both nitrous and fuel together at the carburetor plate or intake runner. This is generally safer for carbureted engines compared to “dry” systems because it ensures the engine doesn’t run lean (too much air, not enough fuel) when the nitrous hits.
Key Features
- Budget-Friendly Performance: You get the same solenoids and reliable components found in more expensive kits, just without the chrome finish.
- Versatility: Whether you run a standard Holley 4-barrel, a massive Dominator, or a classic Quadrajet, there is a kit designed to fit.
- Scalable Power: These systems are jet-able, meaning you can change the horsepower output by swapping out the jets. Most kits allow for adjustments between 100 and 250 horsepower.
When you shop for performance parts, you want to know you aren't sacrificing reliability for cost. With the MainLine systems, you get a product made in the USA that utilizes the same technology that has set world records on the track.
Features and Benefits of the MainLine Series
Why should you install a MainLine system over other power adders? Here is a deeper look at the value these kits provide.
Massive Horsepower Gains
The primary benefit is the sheer amount of power you can add instantly. Depending on the specific kit you choose, you can expect an increase ranging from 100 to 250 horsepower. For the ML4000 kit, that number jumps up to 400 horsepower. This isn't theoretical power; it is instant torque that you feel the moment you arm the system and hit the throttle.
All-Inclusive Design
These are "complete" systems. When you order a MainLine kit, it typically includes:
- A 10 lb. white nitrous bottle with a standard valve.
- Stainless steel bottle brackets for secure mounting.
- High-flow solenoids (Carbon Fiber or standard, depending on the specific update).
- Braided stainless steel hose lines (usually D-4 style).
- Mounting hardware, switches, and relay harnesses.
- A variety of jets to tune your power level.
Durability and Quality
Even though these are budget systems, Nitrous Express does not cut corners on the critical components. The solenoids are built to withstand the high pressure of nitrous oxide without failing. The jets are precision-machined to ensure accurate fuel-to-nitrous ratios, keeping your engine safe.
Free Shipping and Value
When you purchase these systems through major retailers like Summit Racing, you often benefit from free shipping. Considering the weight of a 10 lb. bottle and the comprehensive nature of the kit, this adds significant value to the purchase price. It allows you to put that saved money back into other parts of your car, like better tires or a stronger clutch.
Breakdown of Available MainLine Kits
Nitrous Express offers several variations of the MainLine system to ensure a perfect fit for your specific carburetor and intake setup. Here is a detailed look at the most popular options available on the page.
Nitrous Express MainLine Carbureted Nitrous Systems ML1000
Nitrous Oxide System, MainLine, Wet, 100-250 hp, 10 lb. Bottle, White, Square Bore, 4-Barrel, Kit
NEX-ML1000: The Standard Square Bore Solution
- Price: ~$524.31
- Best For: Most American V8s with a standard 4150-style carburetor (Holley, Edelbrock, etc.).
This is the bread-and-butter kit for most muscle car owners. If you have a standard 4-barrel carburetor with a square-bore flange, this is the one you want. It features a nitrous plate that is sandwiched between your carburetor and intake manifold.
- Power: Adjustable from 100 to 250 HP.
- Components: Includes the 10 lb. bottle, white finish, and all necessary plumbing.
Nitrous Express MainLine Carbureted Nitrous Systems ML1001
Nitrous System, Mainline 4500 Carb kit, w/ 10 lb bottle
NEX-ML1001: The Dominator Kit
- Price: ~$549.76
- Best For: High-horsepower racing engines using a 4500-series Dominator carburetor.
If you are running a massive big block with a Dominator carb, you need a system that flows enough to keep up. The ML1001 is designed with a larger plate to match the 4500 flange.
- Power: Maximum advertised increase of 250 HP.
- Jet Sizes Included: 50, 100, 150, 200, 250 HP settings.
Nitrous Express MainLine Carbureted Nitrous Systems ML1002
Nitrous System, Mainline Q-Jet Carb kit, w/ 10 lb bottle
NEX-ML1002: The Quadrajet Specialist
- Price: ~$549.76
- Best For: Restoration builds, GM muscle cars, and sleepers running a Quadrajet (Q-Jet) carburetor.
The Quadrajet has a unique "spread bore" bolt pattern (small primaries, massive secondaries). You cannot use a standard square-bore plate on these without an adapter, which ruins hood clearance. The ML1002 comes with a specialized plate designed specifically for the Q-Jet bolt pattern.
- Power: Up to 250 HP.
- Fitment: Direct fit for Spread Bore Quadrajet setups.
Nitrous Express MainLine Carbureted Nitrous Systems ML4000
Nitrous System, Mainline, Sport Compact, Low Pressure, Direct Port, w/ 10 lb Bottle
NEX-ML4000: The Direct Port Powerhouse
- Price: ~$1,011.08
- Best For: Serious racers needing maximum distribution and power.
Unlike the plate systems above, the ML4000 is a "Direct Port" system. This means you drill into your intake runner and install a nozzle for every single cylinder. This ensures perfectly equal distribution of nitrous and fuel to every cylinder, which is safer at high horsepower levels.
- Power: Maximum advertised increase of 400 HP.
- Jet Sizes Included: 100, 200, 300 HP settings.
- Configuration: Ideal for Sport Compact or V8 applications requiring precise tuning.
Installation and Setup: What to Expect
Installing a nitrous system is a rite of passage for many mechanics. While it is more involved than changing an air filter, it is something a competent DIYer can handle with the right tools and patience. However, beginners should first learn basic mechanical skills before attempting to install a nitrous express system.
Customers have mixed experiences with installing the nitrous oxide system, with some finding it easy while others report it taking 3 hours to complete. Several customers also report missing parts and installation issues with the nitrous oxide system.
The General Process
- Mount the Bottle: Choose a safe location, usually in the trunk. Use the included stainless steel brackets. Ensure the bottle valve is easily accessible and the vent tube (if used) routes outside the vehicle.
- Run the Lines: Route the heavy-duty feed hose from the bottle to the engine bay. Avoid routing it near moving suspension parts or hot exhaust pipes.
- Install the Plate/Nozzles: For the ML1000/1001/1002, remove your carburetor, install the nitrous plate with new gaskets, and reinstall the carb. For the ML4000, you will need to drill and tap your intake manifold.
- Wiring: Connect the solenoids to the relay and activation switches. Most setups use a wide-open throttle (WOT) switch to ensure the nitrous only activates when your foot is floored.
- Fuel Supply: Tee into your fuel line to supply the fuel solenoid. You must ensure your fuel pump can handle the extra demand.
Critical Safety Tips
- Check for Leaks: Never open the bottle until you have checked all connections. Use soapy water to look for bubbles.
- Fuel Pressure: Nitrous requires fuel. If your fuel pressure drops, your engine runs lean, and you risk melting a piston. Installing a fuel pressure safety switch is highly recommended.
- Bottle Temperature: Nitrous pressure is determined by bottle temperature. To maintain consistent performance, you may want to add a bottle heater and a pressure gauge.
- Purge Valve: While not always included in the basic kits, adding a purge valve helps clear air out of the lines before a run, ensuring instant liquid nitrous hits the engine.
If you are unsure about the installation, do not hesitate to view instructional videos online or consult a professional shop. An installation error can be costly, so if you don't feel confident, pay a pro to do it right.
Maintenance and Upkeep: Keeping Your MainLine Nitrous System at Peak Performance
To get the most out of your MainLine nitrous oxide system, regular maintenance is key. Keeping your nitrous system in top shape not only maximizes performance but also ensures your vehicle remains safe and reliable, whether you’re tearing up the track or enjoying a spirited drive.
Start by routinely inspecting all hoses and fittings for any signs of wear, cracking, or leaks. Nitrous oxide operates under high pressure, so even a small leak can impact system performance and safety. Use soapy water to check connections; bubbles indicate a leak that needs immediate attention.
Next, pay close attention to your nitrous bottle. Always store the bottle upright in a cool, dry area when not in use, and check the bottle’s pressure gauge before every run. If you notice inconsistent pressure readings, it may be time to have the bottle valve serviced or the bottle itself recertified. Remember to keep the bottle clean and free from debris, and never use a damaged or expired bottle.
The solenoids and jets are the heart of your nitrous system. Periodically remove and clean the jets to prevent clogging, which can affect the fuel-to-nitrous ratio and overall performance. Inspect the solenoids for any signs of sticking or electrical issues, and replace filters as needed to keep contaminants out of the system.
Don’t forget to check your fuel system as well. A clogged fuel filter or weak pump can lead to a lean condition, risking engine damage when the nitrous is engaged. Make it a habit to inspect and, if necessary, upgrade your fuel delivery components to match the demands of your nitrous kit.
By following these simple maintenance steps, you’ll ensure your nitrous system delivers consistent, safe, and fast power every time you hit the switch. Regular upkeep not only protects your investment but also lets you enjoy the full potential of your vehicle’s performance for years to come.
Customer Reviews and Ratings
The Nitrous Express MainLine systems maintain a stellar reputation in the community. Customers find the nitrous oxide system to be a great starter kit that works well and offers good value for money. On Summit Racing, specifically for the ML1000 and ML1001, these kits consistently pull in 4.5 to 5-star ratings.
Many users refer to the system as an NOS (nitrous oxide system), sharing positive experiences with installation and noting the significant boost in vehicle performance during testing. Customers also highlight that the nitrous oxide system is good value for money.
What Users Are Saying
- Ease of Install: Many users report that the instructions are clear, and the universal nature of the kit makes it easy to adapt to different vehicles.
- Value: The recurring theme in reviews is "bang for the buck." Customers agree that you cannot beat the horsepower-per-dollar ratio of these kits.
- Performance: Users frequently mention the immediate difference in drive quality on the track. The transition is smooth, and the power delivery is consistent.
- Components: The white bottle is a favorite for its clean look, and the quality of the braided hose and fittings receives high marks.
Positive feedback often highlights that the system contains everything needed to get started, though experienced users suggest buying a few extra accessories, like a purge kit or a bottle heater, to complete the experience.
Navigating Your Purchase of Nitrous Kits
When you are ready to buy, the Summit Racing website makes it easy. You can filter your search by engine type or carburetor flange to ensure you choose the right kit.
If you have questions, Summit Racing offers excellent customer support. You can email them or call their tech line. Their experts can help you verify fitment so you don't order the wrong type of system.
Make sure to check the "Required Parts" tab on the product page. While the kits are complete, you might need specific spark plugs (usually one or two steps colder) to run nitrous safely.
Conclusion
If you want to go fast without emptying your bank account, the Nitrous Express MainLine Carbureted Nitrous Systems are the answer. They offer a perfect blend of American-made quality, reliability, and raw power.
Whether you have a classic muscle car with a Quadrajet or a drag strip monster with a Dominator, there is a MainLine kit built for you. You don't need to wait to save up for a turbo kit. You can create massive power today.
Don't get left behind at the light. Update your ride with a Nitrous Express system and experience the thrill of chemical horsepower. Visit Summit Racing to view and read the full lineup and order yours today.
Thank you for reading!
Your friend,
Todd
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