Header Collectors 2.5" 3 Bolt Flange Inlet 2.5" Outlet Pair

2.5-Inch Stainless Steel Exhaust Header Collectors with O2 Sensor Bungs

Complete your custom exhaust system with these 2.5-inch stainless steel exhaust header collectors with integrated oxygen sensor bungs. Designed for headers using a standard 2.5-inch 3-bolt collector flange, these collectors provide a durable connection between your headers and exhaust tubing while giving you a convenient location for installing an oxygen sensor.

Each collector features a full 2.5-inch inlet and 2.5-inch outlet, helping maintain consistent exhaust flow without reducing the collector diameter. The welded O2 sensor bung is supplied with a threaded plug and can accommodate narrowband or wideband oxygen sensors, making these collectors suitable for EFI systems, engine tuning, and custom exhaust applications.

Adjustable O2 Sensor Positioning

A key feature of these stainless steel header collectors is the fixed welded flange design. The collector can be bolted to the header in multiple orientations, allowing you to choose from three different clocking positions.

This positioning flexibility makes it easier to locate the oxygen sensor where it has better clearance from the chassis, steering components, transmission, engine, and other exhaust components.

Built for Custom Exhaust Systems

Constructed from corrosion-resistant stainless steel, these 2.5-inch exhaust collectors are designed for long-term durability in demanding automotive applications. They are well suited for LS swaps, muscle cars, hot rods, street rods, race cars, engine swaps, and custom fabricated exhaust systems using a compatible 2.5-inch three-bolt collector flange.

Whether you're building a new exhaust system or modifying an existing header setup, these collectors provide a practical connection point while maintaining the 2.5-inch exhaust diameter and providing an integrated O2 sensor mounting location.

Key Features

• 2.5-inch inlet and 2.5-inch outlet

• Designed for 2.5-inch 3-bolt header collector flanges

• Integrated welded oxygen sensor/O2 bung

• Compatible with narrowband and wideband O2 sensors

• Includes threaded O2 bung plugs

• Three selectable O2 sensor clocking positions

• Helps improve clearance around steering, chassis, transmission, and exhaust components

• Stainless steel construction for corrosion resistance and durability

• Suitable for custom exhaust fabrication and header applications

• Ideal for LS swap headers, muscle cars, hot rods, street rods, race cars, and engine swaps

Package Includes

• 2 × Stainless Steel Header Collectors

• 2 × Copper Collector Gaskets

• 6 × Collector Bolts

• 6 × Locking Flange Nuts

• 2 × O2 Bung Plugs Installed

Frequently Asked Questions

What size exhaust headers do these collectors fit?
These collectors are designed for headers equipped with a standard 2.5-inch 3-bolt collector flange.

What is the inlet and outlet size?
Both the inlet and outlet are 2.5 inches, allowing the exhaust system to maintain the collector diameter without a built-in reduction.

Do these collectors have oxygen sensor bungs?
Yes. Each collector has a welded oxygen sensor bung with a threaded plug, allowing installation of a narrowband or wideband O2 sensor.

Can I change the O2 sensor position?
Yes. The collector can be bolted to the header in different orientations, providing three clocking positions to help position the O2 sensor and improve component clearance.

Are these collectors suitable for LS swaps?
Yes. They are commonly used with LS swap shorty headers and custom exhaust systems, provided the header uses a compatible 2.5-inch three-bolt collector flange.

What are these exhaust collectors made from?
They are constructed from corrosion-resistant stainless steel for durability and long service life.