Exhaust Headers for Honda Civic (1988-2000) 1.5L 1.6L

High-Flow Exhaust Headers for 1988-2000 Honda Civic

Replaces the restrictive factory cast-iron exhaust manifold to improve exhaust scavenging and lower engine bay temperatures.

The Stock D-Series Shortcoming

The OEM cast-iron exhaust manifolds found on the D15 and D16 SOHC engines are notoriously restrictive, designed primarily for cost-effective mass production and emissions compliance rather than optimized flow. Over decades of thermal cycling, these heavy factory manifolds are prone to heat retention, cracking along the collector, and excessive heat soak within the engine bay. The internal surface of the factory cast manifold is rough, creating turbulent airflow that impedes exhaust gas velocity, increases backpressure, and ultimately stifles the engine's volumetric efficiency across the RPM band.

The Engineering Solution

This 2-piece 4-2-1 exhaust header system is engineered to maximize exhaust gas velocity and eliminate the backpressure inherent to the factory setup. Constructed from CNC-machined T-304 stainless steel, the mandrel-bent piping maintains a consistent diameter throughout the primary and secondary tubes. The 4-2-1 design optimizes mid-range torque and high-RPM horsepower by improving the exhaust scavenging effect. Computerized TIG-welded flanges ensure structural integrity and a leak-free seal under extreme thermal stress. Featuring a 1.75-inch inlet and a 2.0-inch outlet, this header smoothly transitions exhaust gases out of the cylinder head. Pre-welded hangers align perfectly with factory mounting points, ensuring a direct bolt-on installation without the need for custom fabrication or cutting.

Technical Specifications

Compatibility

• 1988-2000 Honda Civic (1.5L / 1.6L D-Series SOHC Engines Only)

The Honda Performance Standard

Built for the dedicated tuner, this header delivers the crisp exhaust note, enhanced throttle response, and optimized powerband required for naturally aspirated JDM performance builds.

Common Questions

Will this exhaust header fit my 1988-2000 Honda Civic?
Yes, this header fits 1988-2000 Honda Civic EF, EG, and EK models equipped with the 1.5L (D15) or 1.6L (D16) D-Series SOHC engine.

Will this fit a 1999-2000 Civic Si or a B-Series DOHC engine swap?
This header is built specifically for 1.5L and 1.6L D-Series SOHC (D15 and D16) engines.

What are the inlet and outlet diameters on this header?
It features a 1.75-inch inlet and a 2.0-inch outlet in a 2-piece, 4-2-1 tubular configuration.

What material is the header made from?
It is constructed from mandrel-bent T-304 stainless steel with CNC-machined, TIG-welded flanges.

Does installation require cutting or welding?
The 2-piece header is a direct bolt-on replacement for the factory cast-iron manifold and uses pre-welded hangers that line up with the factory mounting points.