The Genuine Honda OEM Exhaust Pipe & Catalytic Converter Gasket (18302-SP0-003) is an original equipment replacement gasket designed to provide a secure, leak-resistant seal between designated exhaust system components on compatible Honda vehicles.

Also identified as the Converter & Pipe Gasket, this genuine Honda component is commonly used at factory exhaust connections involving the catalytic converter, front exhaust pipe, or other exhaust piping assemblies.

Exhaust systems operate under extreme temperatures and repeated heating and cooling cycles. Over time, exhaust gaskets can deteriorate, become compressed, or lose their ability to maintain a proper seal. A damaged gasket can allow exhaust gases to escape, potentially causing increased exhaust noise, unwanted fumes, and reduced exhaust system efficiency.

Manufactured to Honda's original equipment specifications, the 18302-SP0-003 is designed to match the factory sealing arrangement on applications that specify this part number. Its formed ring-style construction helps create the intended seal when installed between compatible exhaust components.

Whether replacing a catalytic converter, repairing an exhaust leak, or reinstalling factory exhaust piping, the Honda 18302-SP0-003 Exhaust Pipe Gasket provides a dependable OEM replacement solution.

Features

• Genuine Honda OEM Part: Original equipment replacement gasket manufactured to Honda specifications.

• Honda Part Number 18302-SP0-003: Factory identification for accurate replacement.

• Exhaust Pipe & Converter Application: Designed for specified catalytic converter and exhaust pipe connections.

• Factory-Style Ring Gasket: Matches the intended OEM sealing arrangement.

• High-Temperature Exhaust Application: Designed for the demanding operating environment of factory exhaust systems.

• Leak-Resistant Seal: Helps prevent exhaust gases from escaping through the connection.

• Direct OEM Replacement: Fits compatible factory exhaust assemblies without modification.

• Replacement During Exhaust Service: Suitable for catalytic converter and exhaust pipe maintenance.

• Restores Factory Sealing: Helps correct leaks caused by damaged or deteriorated original gaskets.

• Single-Use Replacement Component: Intended to be replaced after disassembly rather than reused.

• OEM Exhaust Restoration: Maintains the original factory connection design.

• Individual Replacement: Sold as one gasket for targeted repairs.

• Honda OEM Quality: Provides factory-specification fitment for designated applications.

Popular Performance Applications

Honda part number 18302-SP0-003 is used in numerous factory exhaust configurations. Compatibility depends on the vehicle's year, engine, trim, and exhaust assembly.

Honda Accord

• 2003–2007 Honda Accord: Selected four-cylinder exhaust configurations.

• 2008–2012 Honda Accord: Selected factory catalytic converter and exhaust pipe connections.

• 2013–2017 Honda Accord: Selected four-cylinder applications.

• 2018–2022 Honda Accord: Selected factory exhaust configurations.

• 2023–2025 Honda Accord: Selected 1.5L turbocharged applications.

Honda CR-V

• 2010–2014 Honda CR-V: Selected factory exhaust pipe connections.

• 2015–2019 Honda CR-V: Selected catalytic converter and exhaust pipe applications.

• 2020–2026 Honda CR-V: Selected exhaust configurations.

Honda Odyssey

• 2005–2010 Honda Odyssey: Selected factory exhaust system connections.

Honda Pilot

• 2005–2008 Honda Pilot: Selected factory exhaust system applications.

Performance & Maintenance Applications

• Factory catalytic converter replacement.

• OEM exhaust pipe repairs.

• Exhaust leak correction.

• Factory exhaust system restoration.

• Maintenance of original exhaust connections.

• Reinstallation of compatible factory exhaust components.

Important Fitment Note: The listed model years represent applications found in OEM parts catalogs, not universal fitment across every trim or engine. Verify the exact exhaust connection using the vehicle's VIN or Honda OEM parts diagram before ordering.

This gasket should not be assumed compatible with aftermarket headers, custom exhaust flanges, or high-flow catalytic converters unless those components are designed to use the corresponding factory gasket.

Additional Information

• Manufacturer: Honda Motor Co., Ltd.
• Brand: Genuine Honda
• Part Number: 18302-SP0-003
• OEM Description: Gasket, Exhaust Pipe
• Alternate Description: Converter & Pipe Gasket
• Product Type: Exhaust Pipe / Catalytic Converter Sealing Gasket
• Design: Formed Ring-Style Exhaust Gasket
• Primary Application: Factory Exhaust Pipe and Catalytic Converter Connections
• Installation Location: Varies by Vehicle and Exhaust Configuration
• Fitment Type: Direct OEM Replacement
• Vehicle Fitment: Select Honda Accord, CR-V, Odyssey, Pilot, and Additional Applications
• Quantity: One Gasket
• Reusability: Single-Use Replacement Component

Genuine Honda OEM Construction

The 18302-SP0-003 is designed to meet Honda's original equipment requirements for the designated exhaust connection.

Its factory-style shape and dimensions are intended to match the corresponding exhaust pipe and catalytic converter sealing surfaces.

Using the correct OEM gasket helps restore the original sealing arrangement without relying on universal exhaust gasket materials or incorrectly sized replacements.

Exhaust Pipe & Catalytic Converter Sealing

This gasket is installed at specific connections between factory exhaust components.

Depending on the vehicle, the connection may involve the catalytic converter, front exhaust pipe, or another section of the factory exhaust system.

The gasket helps seal the joint when the mating components are properly aligned and secured using the specified mounting hardware.

A properly sealed exhaust connection helps reduce unwanted exhaust noise and prevent exhaust gases from escaping through the joint.

High-Temperature Exhaust Applications

Exhaust gaskets are exposed to elevated temperatures and repeated thermal expansion.

The 18302-SP0-003 is intended for the operating conditions of compatible factory exhaust systems.

During normal operation, the gasket must maintain its sealing function while the surrounding metal exhaust components expand and contract.

Factory-Style Ring Gasket Design

The 18302-SP0-003 features a formed ring-style sealing design.

Unlike flat, multi-bolt flange gaskets, this style is intended to seat within the corresponding factory exhaust connection.

The shape and dimensions of the gasket are important for proper sealing.

Important: Do not substitute a flat flange gasket or a different exhaust donut gasket unless the replacement is specifically approved for the application.

Preventing Exhaust Leaks

A damaged or incorrectly installed exhaust gasket may allow exhaust gases to escape between connected components.

Common symptoms of a leaking exhaust connection include:

• Increased exhaust noise.

• Ticking or hissing sounds near the exhaust connection.

• Exhaust odors around the vehicle.

• Visible soot near the joint.

• Reduced sealing performance after exhaust repairs.

Replacing a damaged gasket can help restore the connection when the surrounding exhaust components and mounting hardware are in good condition.

Single-Use Exhaust Gasket

Honda parts catalogs identify this gasket as a component that should not be reused after removal.

Once compressed between exhaust components, the gasket may no longer provide the intended seal if reinstalled.

For this reason, replacing the gasket whenever the corresponding exhaust connection is disassembled is recommended.

OEM vs. Universal Exhaust Gaskets

Universal exhaust gaskets may differ in thickness, diameter, profile, and sealing characteristics.

Even when a universal gasket appears similar, it may not fit the factory connection correctly.

The genuine Honda 18302-SP0-003 is designed for applications that specifically call for this part number.

Exhaust Mounting Hardware

Proper gasket sealing also depends on the condition of the surrounding exhaust components and mounting hardware.

During installation, inspect the applicable:

• Exhaust flange or gasket seat.

• Mounting studs and bolts.

• Retaining nuts.

• Exhaust springs, where equipped.

• Exhaust pipe alignment.

Corroded or damaged hardware may prevent the connection from being tightened correctly.

Replacement Quantity

The number of gaskets required depends on the vehicle and the exhaust components being serviced.

This listing includes one gasket only. Check the factory exhaust diagram to determine whether additional gaskets or hardware are needed.

Common Reasons for Replacement

• Exhaust Leaks: Replaces a damaged gasket allowing exhaust gases to escape.

• Catalytic Converter Replacement: Provides a fresh seal during converter installation.

• Exhaust Pipe Repairs: Replaces the original gasket when the exhaust connection is opened.

• Deteriorated Gasket: Restores sealing performance after years of heat exposure.

• Increased Exhaust Noise: Helps correct leaks caused by a compromised gasket.

• Exhaust Odors: Addresses leaks at the designated exhaust connection.

• Factory Exhaust Restoration: Maintains the original Honda sealing arrangement.

• Damaged Gasket During Disassembly: Replaces a gasket that cannot be safely reused.

• Incorrect Aftermarket Gasket: Restores the proper OEM gasket configuration.

• Preventative Maintenance: Provides a new seal when servicing factory exhaust components.

Installation Notes

1. Verify Vehicle Compatibility: Confirm that Honda part number 18302-SP0-003 is specified for the exact exhaust connection.

2. Allow the Exhaust to Cool: Ensure the catalytic converter and exhaust piping are completely cool before beginning.

3. Safely Support the Vehicle: Use an appropriate vehicle lift or properly rated jack stands.

4. Locate the Exhaust Connection: Identify the gasket location using the factory exhaust diagram.

5. Remove the Existing Hardware: Carefully loosen the corresponding exhaust fasteners.

6. Separate the Exhaust Components: Follow the Honda service manual procedure.

7. Remove the Original Gasket: Discard the old gasket rather than attempting to reuse it.

8. Inspect the Sealing Surfaces: Check for corrosion, deformation, cracks, or damage.

9. Clean the Gasket Seat: Remove debris and old gasket material without damaging the sealing surfaces.

10. Inspect the Replacement Gasket: Verify that the new gasket is undamaged and matches the required configuration.

11. Install the New Gasket: Position it correctly within the designated exhaust connection.

12. Align the Exhaust Components: Ensure the mating components are properly seated.

13. Inspect Mounting Hardware: Replace damaged or excessively corroded hardware as necessary.

14. Tighten to Factory Specifications: Follow the appropriate Honda service manual procedure and torque values.

15. Verify Exhaust Alignment: Ensure the piping is not under excessive stress.

16. Check for Exhaust Leaks: Inspect the repaired connection after starting the engine.

17. Reinspect After Installation: Confirm proper sealing and hardware security after initial operation.

Important: Do not apply universal gasket sealants or adhesives unless specifically directed by the Honda service manual. Proper gasket seating, exhaust alignment, and mounting hardware condition are essential for a reliable seal.

What's Included

• (1) Genuine Honda OEM Exhaust Pipe & Catalytic Converter Gasket – 18302-SP0-003

Note: This listing includes one OEM Honda exhaust gasket only. Catalytic converters, exhaust piping, mounting bolts, nuts, springs, and additional gaskets are not included.

Restore a secure factory exhaust connection with the Genuine Honda OEM Exhaust Pipe & Catalytic Converter Gasket (18302-SP0-003).

Designed to Honda's original equipment specifications, this replacement gasket provides the proper factory-style sealing arrangement for compatible catalytic converter and exhaust pipe connections.

Whether repairing an exhaust leak, replacing a catalytic converter, or maintaining your Honda's factory exhaust system, Honda 18302-SP0-003 delivers dependable OEM fitment and genuine Honda quality.