Stainless Steel Header Manifold for Toyota FJ Cruiser (2007-2009) 4.0L Engine

Waking up the 1GR-FE isn't about chasing dyno sheets—it's about fixing that restrictive, heat-soaked factory manifold and getting the throttle response your FJ Cruiser deserves on the trail.

Performance Stainless Steel Header Manifold Kit for Toyota FJ Cruiser (1GR-FE)

If you have spent any time under the hood of a 2007-2009 FJ, you know the factory exhaust manifolds are a major bottleneck. Designed for mass production rather than flow, the stock units often struggle with heat cycling and restrictive internal geometry that chokes the 4.0L V6. For the enthusiast who actually uses their rig for overlanding or technical climbs, that "clogged" feeling in the mid-range is more than just an annoyance—it's a limitation.

This 2-piece 3-1 stainless steel header kit is the mechanical solution to that problem. By replacing the cast-iron restrictions with CNC-machined T-304 stainless steel piping, you are significantly reducing backpressure. This isn't just about sound; it is about scavenging exhaust gases more efficiently to help the engine breathe under load. Whether you are aired-down on a steep grade or merging onto the highway with a full roof rack, the improvement in torque delivery is immediate and noticeable.

We know Toyota owners demand reliability. These headers feature computerized TIG-welded flanges to prevent the common warping and leaking issues found in cheaper alternatives. The 1GR-FE is a legendary workhorse, and this kit provides the breathing hardware to match its bulletproof reputation.

Why You Need This Upgrade

• T-304 Stainless Construction: Resists the corrosion and rust often caused by mud, salt, and off-road debris.
• 3-1 Scavenging Design: Improves exhaust flow velocity, providing a tangible bump in horsepower and low-end torque.
• TIG-Welded Flanges: CNC-machined for a flat, true mating surface that ensures a leak-free seal against the cylinder head.
• Direct Bolt-On Fitment: Includes pre-welded hangers designed to align with factory mounting points for a cleaner installation.
• Precision Mandrel Bends: Maintains a consistent internal diameter throughout the pipe to eliminate turbulence.

Installation Notes

While this kit is designed as a direct bolt-on replacement, header installations on the 4.0L V6 platform can be tight. You will be working in a confined space near the steering shaft and frame rails. We highly recommend using new OEM gaskets and checking torque specs after the first few heat cycles. No installation guides are included; if you aren't comfortable with manifold removal, seek professional assistance at a trusted exhaust shop.

Replaces These OEM Applications & Part Numbers

• 2007 Toyota FJ Cruiser 4.0L V6 (1GR-FE)
• 2008 Toyota FJ Cruiser 4.0L V6 (1GR-FE)
• 2009 Toyota FJ Cruiser 4.0L V6 (1GR-FE)

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

Ditch the restrictive factory cast iron and give your FJ the durability and flow it needs for the long haul.