Honda OEM Exhaust Manifold Gasket 18115-P72-003 – B-Series Engines

Honda OEM Exhaust Manifold Gasket 18115-P72-003 – B-Series Engines

The Honda OEM exhaust manifold gasket 18115-P72-003 is a genuine, single-layer gasket used in many popular Honda B-series engines, including B16A1, B16A2, B18C4 and B18C6. Its role is to provide a tight and reliable seal between the cylinder head and the exhaust manifold, ensuring proper exhaust flow, stable lambda sensor readings and consistent engine performance.

Honda designed this gasket as a single-layer metal seal, which offers excellent thermal resistance and stability even in high-RPM VTEC engines. The material maintains its shape under heat, preventing leaks and loss of power.

Applications – Honda B-Series Engines

Compatible with the following engine codes:

• B16A1
• B16A2
• B18C4
• B18C6

Commonly used in models such as the Civic VTi (EG6, EK4), CRX EE8/EH6 and selected Integra models equipped with B-series engines.

Why Choose the Honda OEM 18115-P72-003 Gasket?

• Single-layer OEM construction – correct material and thickness for B-series exhaust ports.
• High thermal resistance – handles high exhaust temperatures in VTEC engines.
• Perfect fit – precision port alignment and bolt spacing.
• No exhaust leaks – ensures stable manifold pressure and proper sensor readings.
• Durability superior to cheap aftermarket gaskets.

FAQ – Honda 18115-P72-003 Exhaust Gasket

1. Is this gasket multi-layer?
No. This is a single-layer OEM gasket designed specifically for B-series exhaust manifolds.

2. Does it fit all B-series engines?
It fits the most common B16 and B18 variants (A1, A2, C4, C6). For rare versions, VIN confirmation is recommended.

3. Can I use it with an aftermarket exhaust manifold?
Yes – most aftermarket 4-2-1 and 4-1 manifolds match the OEM flange pattern.

4. What are the symptoms of a leaking exhaust manifold gasket?
A metallic hiss during acceleration, reduced performance, poor lambda readings, increased fuel consumption, or exhaust odor in the engine bay.