Exhaust Headers for Mitsubishi Eclipse (2000-2005) 2.4L Engine

High-Flow T-304 Exhaust Headers for 2000-2005 Mitsubishi Eclipse (4G64 / D52A)

Replaces the restrictive factory cast-iron manifold with a high-velocity stainless steel header system to improve exhaust scavenging and reduce engine backpressure.

The Stock Eclipse Flow Restriction

The OEM exhaust manifold on the 3rd Gen Mitsubishi Eclipse 2.4L is a heavy cast-iron unit designed primarily for cost-effective mass production and noise dampening. These factory manifolds are notorious for internal turbulence caused by rough casting surfaces and sharp, non-optimized bends that impede exhaust gas velocity. This restriction causes significant backpressure, forcing the 4G64 engine to work harder to evacuate spent gases, which ultimately results in increased cylinder head temperatures and a measurable loss in volumetric efficiency. Over thousands of heat cycles, these cast units are also prone to stress-cracking, leading to exhaust leaks that trigger CEL codes and degrade performance.

The Engineering Solution

This header system is engineered from premium T-304 stainless steel, a high-chromium/nickel alloy that offers superior resistance to corrosion and thermal fatigue. Utilizing mandrel-bent tubing, the system maintains a consistent internal diameter throughout every curve, ensuring laminar flow and maximum gas velocity. The CNC-machined flanges provide a precise, warp-resistant mating surface against the cylinder head to prevent leaks. By optimizing the path of exhaust pulses, these headers facilitate better scavenging, pulling more fresh air into the combustion chamber for improved throttle response. The kit features a 2.061" inlet and a 2.233" outlet, specifically tuned for the airflow requirements of the 2.4L SOHC platform, and includes an O2 sensor bung for a direct-fit integration.

Technical Specifications

Compatibility

• 2000-2005 Mitsubishi Eclipse RS Coupe 2-Door 2.4L
• 2000-2005 Mitsubishi Eclipse GS Coupe 2-Door 2.4L
• 2001-2005 Mitsubishi Eclipse GS Spyder Convertible 2-Door 2.4L

The Mitsubishi Tuning Standard

For the JDM-enthusiast market, maintaining the balance between high-RPM flow and mid-range torque is essential. This header system delivers the aggressive exhaust note expected from a 4G-series engine while providing the structural integrity required for daily spirited driving. Professional installation is recommended to ensure optimal torque specifications on the manifold studs.