Headers Manifold for Honda Accord (2003-2007) 2.4L

High-Flow Stainless Exhaust Manifold Header for 2003-2007 Honda Accord

Replaces the restrictive factory cast iron exhaust manifold to increase exhaust gas scavenging and reduce backpressure for improved engine efficiency.

The Stock Accord Exhaust Restriction

The factory 2003-2007 Honda Accord 2.4L utilizes a restrictive cast iron exhaust manifold designed primarily for mass production cost-efficiency rather than optimal exhaust flow. This original equipment manufacturer (OEM) manifold creates significant exhaust turbulence and backpressure due to its abrupt, unequal-length runners. This bottleneck leads to heat soak within the engine bay, choking the K24 engine's upper RPM power delivery and limiting volumetric efficiency. Over time, the heavy cast iron material is also prone to heat cycling degradation, resulting in hairline cracks and exhaust leaks that negatively impact both performance and oxygen sensor fuel trim readings.

The Engineering Solution

This 4-2-1 performance exhaust header directly resolves these factory flow limitations. Constructed from premium, corrosion-resistant T304 stainless steel, the manifold features precision CNC-machined flanges that are heavily TIG-welded to prevent warping under extreme thermal loads. The strategic 4-2-1 tubular design merges cylinders in stages, maintaining exhaust gas velocity while significantly reducing reversion. Utilizing 1-5/8" OD primary inlets transitioning smoothly into a 2-1/4" OD outlet, this header optimizes the scavenging effect. This streamlined airflow dynamic allows the K24 engine to exhale properly, yielding an instant gain of 10-15 horsepower and torque improvements throughout the powerband.

Technical Specifications

Compatibility

• 2003 Honda Accord 2.4L 4-Cylinder
• 2004 Honda Accord 2.4L 4-Cylinder
• 2005 Honda Accord 2.4L 4-Cylinder
• 2006 Honda Accord 2.4L 4-Cylinder
• 2007 Honda Accord 2.4L 4-Cylinder

The Honda Performance Standard

By upgrading the exhaust flow on your K-Series engine, you unlock the true breathing capacity of Honda's architecture, delivering sharper throttle response and an aggressive, unrestricted exhaust note.