AutoMeter Fitting Restrictor Adapter

2010–2025 Subaru Forester / Subaru Impreza / Mazda Miata / Honda Civic / Ford Mustang / Chevrolet Camaro 1/8in NPT / -4AN

Part #: 3277

Overview

The AutoMeter Fitting Restrictor Adapter is a high-quality component designed for enthusiasts and professionals who need precise control over fuel and nitrous pressure applications. Whether you're tuning for performance, ensuring safety during nitrous use, or stabilizing fuel pressure readings, this adapter provides a reliable solution to manage pressure fluctuations effectively. Crafted from durable brass, it offers excellent resistance to corrosion and high-pressure environments, making it suitable for both street and racing applications.

If you're looking to improve the consistency of your pressure readings or prevent pressure spikes that can affect engine performance, this restrictor adapter is an essential addition to your fuel or nitrous system. Its compact design allows for easy installation in tight spaces, and its robust construction ensures long-lasting performance under demanding conditions.

Key Features

The AutoMeter restrictor adapter combines precision engineering with durable materials to deliver consistent performance. Here are some of its key features:

• Manufactured from high-quality brass for excellent corrosion resistance and durability in high-pressure environments.
• Designed with a 1/8" NPT male thread on one end and a -4AN male fitting on the other, providing versatile compatibility with a wide range of fuel and nitrous systems.
• Helps regulate pressure spikes and fluctuations, ensuring stable readings and smoother engine operation during high-demand conditions.
• Ideal for use in nitrous oxide systems, fuel pressure regulators, and other high-performance fuel delivery setups.
• Precision-machined to ensure a secure, leak-free connection and consistent flow characteristics.
• Steel construction enhances strength and longevity, making it suitable for racing and street use.
• Easy to install with standard hand tools, requiring no special modifications or additional components.

Construction & Design

This restrictor adapter features a robust steel body with a high-quality brass fitting, combining strength with corrosion resistance. The brass component is precisely machined to ensure a perfect fit and seal, preventing leaks and maintaining consistent pressure control. Its compact design allows for seamless integration into existing fuel or nitrous lines, making it a versatile choice for custom setups and upgrades. The adapter's construction is optimized for high-pressure applications, providing peace of mind during spirited driving or racing conditions.

Performance & Sound

While this restrictor adapter does not directly increase horsepower or torque, it plays a crucial role in maintaining optimal pressure levels within your fuel or nitrous system. By dampening pressure spikes and fluctuations, it helps support consistent engine performance and responsiveness. Its reliable construction ensures that your pressure readings remain stable, contributing to smoother operation and potentially improved power delivery during high-demand scenarios.

Installation & Fitment

The AutoMeter restrictor adapter is designed for straightforward installation. It features a 1/8" NPT male thread that screws into your existing fittings or lines, while the -4AN male end connects to your fuel or nitrous system components. No cutting, drilling, or complex modifications are required. Simply thread the adapter into your system and tighten securely to prevent leaks. Its durable steel construction ensures a secure fit, and it is compatible with standard AN and NPT fittings used in performance automotive applications.

• Compatible with a wide range of fuel and nitrous pressure applications.
• Suitable for use in racing, street performance, and custom builds.
• Easy to install with common hand tools; no additional adapters needed.

What's Included

• AutoMeter Fitting Restrictor Adapter -4AN Male to 1/8in NPT Male
• Installation instructions (if provided)

Ideal For

• Performance enthusiasts seeking pressure regulation in fuel and nitrous systems
• Racers aiming to dampen pressure spikes for consistent engine tuning
• Custom car builders integrating high-pressure fuel or nitrous setups
• Anyone needing a reliable, durable pressure restrictor fitting for high-performance applications

Emissions Note

This product is intended for off-road, racing, or other non-emissions-compliant applications. Please verify local regulations before use on street vehicles.