Stainless Steel Header Manifold Kit for Toyota 4Runner (2003-2012) 4.0L Engine

Waking up the 1GR-FE in your 4Runner isn't about chasing peak dyno numbers—it's about fixing the restrictive, heat-stressed factory manifolds that choke your low-end torque and throttle response.

Performance Stainless Steel Header Manifold Kit for Toyota 4Runner (1GR-FE)

If you have spent any time on the forums, you know the factory exhaust manifolds on the 4.0L 4Runner are a known weak point. Over time, the constant heat cycling of off-roading and towing causes the stock cast units to develop hairline cracks, leading to the dreaded "exhaust tick" and lost manifold vacuum. Beyond durability, the OEM design is purely about cost-cutting, utilizing pinched collectors that create massive backpressure for the 1GR-FE engine family.

This 2-piece 3-1 stainless steel header kit is the mechanical solution to those factory flaws. By moving to CNC-machined T-304 stainless steel piping, you are significantly reducing the thermal load on your cylinder heads. The 3-1 scavenging design ensures that exhaust pulses are timed correctly, pulling spent gases out of the combustion chamber more efficiently. This results in a much-needed boost in mid-range torque—exactly where you need it when climbing a grade or navigating technical terrain.

Constructed by OEM-approved manufacturers, this kit features computerized TIG-welded flanges. Unlike cheap stamped headers that warp and leak after three heat cycles, these flanges stay true, ensuring a permanent seal against the head. It’s a precision-engineered upgrade that respects the "million-mile" reputation of the Toyota 4-liter platform.

Why You Need This Upgrade

• Eliminate OEM Failure: Replaces crack-prone factory cast manifolds with high-strength, TIG-welded T-304 stainless steel.
• Optimized Scavenging: The 3-1 design improves exhaust gas velocity, providing a tangible increase in horsepower and low-end torque.
• T-304 Durability: Superior corrosion resistance compared to stock iron, essential for rigs exposed to mud, snow, and road salt.
• Direct Bolt-On Fit: Includes pre-welded hangers designed to align with your factory 4Runner mounting points without cutting or welding.
• CNC Flanges: Computer-machined mating surfaces prevent exhaust leaks and ensure a perfect fit against the cylinder head.

Installation Notes

While this is a direct bolt-on kit, 4Runner header installs are notoriously labor-intensive due to the tight clearances between the engine block and the frame rails. You will likely need to unbolt the engine mounts and slightly jack up the engine to clear the studs. We highly recommend using new OEM multi-layer steel (MLS) gaskets for the best seal. Professional installation is strongly suggested if you are not comfortable working in tight engine bays.

Replaces These OEM Applications & Part Numbers

• 2003 Toyota 4Runner 4.0L V6 (1GR-FE)
• 2004 Toyota 4Runner 4.0L V6 (1GR-FE)
• 2005 Toyota 4Runner 4.0L V6 (1GR-FE)
• 2006 Toyota 4Runner 4.0L V6 (1GR-FE)
• 2007 Toyota 4Runner 4.0L V6 (1GR-FE)
• 2008 Toyota 4Runner 4.0L V6 (1GR-FE)
• 2009 Toyota 4Runner 4.0L V6 (1GR-FE)
• 2010 Toyota 4Runner 4.0L V6 (1GR-FE)
• 2011 Toyota 4Runner 4.0L V6 (1GR-FE)
• 2012 Toyota 4Runner 4.0L V6 (1GR-FE)

17140-31070, 17150-31070, 17141-31070, 17151-31070, 17141-31080, 17151-31080, 17140-31210, 17150-31210

Stop settling for a choked-down V6 and give your 4Runner the breath of life it needs for your next adventure.