2.5" 3-Bolt Header Collectors – Stainless Steel Pair

Create a clean connection between compatible 2.5-inch 3-bolt exhaust headers and a custom 2.5-inch exhaust system with these 2.5" Header Collectors from Certified Automotive Experts. Designed for custom exhaust fabrication, these collectors feature a standard 2.5-inch 3-bolt flange and full 2.5-inch outlet, making the matched pair well suited for LS swaps, hot rods, muscle cars, street rods, classic cars, and custom exhaust builds.

Unlike the O2-bung version, these 2.5-inch exhaust collectors feature a clean, uninterrupted tube with no oxygen sensor bung. This makes them a practical choice when the O2 sensor will be installed farther downstream in the exhaust system or when an oxygen sensor provision at the header collector is not required.

The collectors are manufactured from corrosion-resistant stainless steel and supplied as a matched pair. Stainless steel construction provides durability for automotive exhaust applications where components are exposed to high temperatures, moisture, and repeated exhaust heat cycles.

Each pair includes two solid copper 2.5-inch 3-bolt collector gaskets. Copper provides a durable sealing surface capable of handling repeated exhaust heat cycles while conforming under flange clamping pressure for a reliable header-to-collector connection.

The package includes two 2.5-inch stainless steel header collectors and two copper 3-bolt collector gaskets. Bolts and nuts are not included.

Key Features

• Designed for 2.5-inch 3-bolt exhaust headers

• Full 2.5-inch exhaust outlet

• Clean no-O2-bung design

• Corrosion-resistant stainless steel construction

• Designed for custom exhaust fabrication

• Includes 2 copper 2.5-inch 3-bolt collector gaskets

• Supplied as a matched pair

• Suitable for LS swaps, hot rods, muscle cars, street rods, and classic vehicles

• Bolts and nuts not included

2.5-Inch 3-Bolt Header Connection

Each collector features a standard 2.5-inch 3-bolt flange, providing a straightforward connection to compatible exhaust headers. The full 2.5-inch outlet is designed to connect with compatible 2.5-inch exhaust tubing when building or modifying a custom exhaust system.

This makes these collectors a useful component for builders working on LS engine swaps, performance exhaust systems, hot rods, muscle cars, street rods, and custom-built vehicles.

Clean No-O2-Bung Design

These collectors do not include an integrated oxygen sensor bung. The uninterrupted collector tube provides a simple exhaust path for applications where an O2 sensor is installed farther downstream.

If your exhaust system does not require an oxygen sensor provision at the collector, this no-bung design provides a clean and uncomplicated solution for custom exhaust fabrication.

Stainless Steel Construction

The collectors are made from corrosion-resistant stainless steel, providing durability for demanding automotive exhaust applications.

Stainless steel is well suited for exhaust components because of its resistance to corrosion and its ability to withstand the repeated temperature changes associated with engine and exhaust operation.

Copper Collector Gaskets Included

Each pair includes two solid copper 2.5-inch 3-bolt collector gaskets.

Copper provides a durable sealing surface designed to withstand repeated exhaust heat cycles. Its ability to conform under flange clamping pressure makes it well suited for header collector applications.

Ideal Applications

These 2.5-inch header collectors are suitable for:

• LS engine swaps

• Small Block Chevy applications

• Big Block Chevy applications

• Hot rods

• Muscle cars

• Street rods

• Classic cars

• Classic trucks

• Engine swaps

• Custom exhaust systems

• Performance exhaust builds

• Custom exhaust fabrication

What's Included?

Each pair includes:

• 2 × 2.5" stainless steel header collectors

• 2 × 2.5" copper 3-bolt collector gaskets

Bolts and nuts are not included.

Product Specifications

Fitment & Compatibility

These collectors are designed for exhaust headers using a compatible 2.5-inch 3-bolt collector flange and exhaust systems requiring a 2.5-inch outlet.

Before ordering, verify:

• Your header collector diameter is 2.5 inches

• Your headers use a compatible 3-bolt flange pattern

• Your exhaust system requires a 2.5-inch outlet

• The collector dimensions provide sufficient clearance

• The header flange matches the collector configuration

This is a universal-style exhaust component and is not vehicle-specific.

Frequently Asked Questions

What size headers do these collectors fit?

They are designed for compatible headers using a 2.5-inch 3-bolt collector flange.

What size is the outlet?

Each collector has a full 2.5-inch outlet for connection to compatible exhaust tubing.

Do these collectors have O2 sensor bungs?

No. These are the no-O2-bung collectors and feature a clean, uninterrupted tube.

Are these header collectors sold as a pair?

Yes. The package includes two stainless steel 2.5-inch header collectors.

Are copper collector gaskets included?

Yes. Two 2.5-inch copper 3-bolt collector gaskets are included.

Are bolts and nuts included?

No. Bolts and nuts are not included with this package.

Are these suitable for LS swaps?

Yes. They are suitable for LS swap applications when used with compatible headers featuring a 2.5-inch 3-bolt collector flange.

Can these be used for custom exhaust fabrication?

Yes. These collectors are designed for custom exhaust systems and fabrication projects requiring a compatible 2.5-inch 3-bolt header connection and 2.5-inch outlet.

Why Choose These 2.5" Header Collectors?

These 2.5-inch stainless steel header collectors provide a straightforward solution for connecting compatible 3-bolt headers to a custom exhaust system. Their standard 3-bolt flange, full 2.5-inch outlet, no-O2-bung design, stainless steel construction, and included copper collector gaskets make them a practical choice for a wide range of automotive exhaust projects.

From LS swaps and muscle cars to hot rods, street rods, classic cars, and custom exhaust builds, these collectors provide the connection needed to continue a compatible 2.5-inch exhaust system.