Exhaust Header Manifold for Toyota Pickup & 4Runner 2WD (1990-1995) 2.4L Engine

High-Flow Black Steel Exhaust Header Manifold for 1990-1995 Toyota 4Runner, Pickup

Replaces the restrictive cast-iron factory exhaust manifold to optimize exhaust scavenging, lower backpressure, and improve upper-RPM power output on 2.4L 22RE 2WD applications.

The Stock 22RE Exhaust Bottleneck

The factory cast-iron exhaust manifold on the N80/N90 Pickup and N130 4Runner was engineered for mass production and basic emissions compliance, not performance. Over decades of extreme heat cycling, these OEM cast manifolds are notorious for warping, blowing out gaskets, cracking between runners, and suffering from severe heat soak. Furthermore, the internal casting flash and abrupt geometric transitions create significant exhaust turbulence and backpressure. This inherent restriction chokes the 2.4L engine, notably suffocating top-end horsepower and limiting throttle response when operating at higher engine speeds.

The Engineering Solution

This long-tube spec exhaust header eliminates factory restrictions by utilizing 16-gauge wall steel piping with computerized mandrel-bends. By transitioning from a 1-1/2" OD inlet to a 2-1/4" OD outlet, the manifold maximizes exhaust gas velocity and promotes efficient cylinder scavenging. The smooth inner walls drastically reduce aerodynamic drag inside the primary tubes, translating directly into enhanced top-end horsepower and torque. Structural integrity is heavily reinforced through precision TIG welding and a robust, CNC-machined 10mm thick header flange that actively resists the thermal warping prevalent in OEM units. Integrated dual O2 sensor flanges ensure proper ECU readings are maintained, while the included metal gaskets are designed to ensure a secure, leak-free seal against the cylinder head under extreme thermal loads.

Technical Specifications

Compatibility

• 1990 Toyota 4Runner 2.4L 22RE (2WD Models Only)
• 1991 Toyota 4Runner 2.4L 22RE (2WD Models Only)
• 1992 Toyota 4Runner 2.4L 22RE (2WD Models Only)
• 1993 Toyota 4Runner 2.4L 22RE (2WD Models Only)
• 1994 Toyota 4Runner 2.4L 22RE (2WD Models Only)
• 1995 Toyota 4Runner 2.4L 22RE (2WD Models Only)
• 1990 Toyota Pickup 2.4L 22RE (2WD Models Only)
• 1991 Toyota Pickup 2.4L 22RE (2WD Models Only)
• 1992 Toyota Pickup 2.4L 22RE (2WD Models Only)
• 1993 Toyota Pickup 2.4L 22RE (2WD Models Only)
• 1994 Toyota Pickup 2.4L 22RE (2WD Models Only)
• 1995 Toyota Pickup 2.4L 22RE (2WD Models Only)

The Toyota Durability Standard

Built for the legendary reliability of the 22RE platform, this header ensures your truck maintains dependable hauling capabilities and thermal efficiency while finally breathing out the top-end power it was designed to produce.

Common Questions

Will this exhaust header fit my 1990-1995 Toyota Pickup or 4Runner?
Yes, this header is built specifically for 1990-1995 Toyota Pickup and 4Runner models equipped with the 2.4L 22RE 4-cylinder engine and 2WD drivetrain.

Is this compatible with 4WD models or other engine sizes?
This header is designed exclusively for 2WD models with the 2.4L 22RE 4-cylinder engine, as 2WD and 4WD chassis have different undercarriage routing.

What are the piping and flange specifications?
It features 16-gauge mandrel-bent steel tubing with a 1-1/2" OD inlet, a 2-1/4" OD outlet, and a CNC-machined 10mm thick flange to resist warping.

Are gaskets and O2 sensor ports included?
Yes, the header comes with metal gaskets for the cylinder head seal and features integrated dual O2 sensor flanges to maintain proper ECU readings.

How does this upgrade improve over the stock cast-iron manifold?
The mandrel-bent long-tube design replaces the restrictive, crack-prone factory cast manifold to lower backpressure, improve exhaust scavenging, and boost top-end horsepower and torque.