Stainless Steel Header Manifold Kit for Toyota 4Runner (2003-2012) 4.0L EngineWaking up the 1GR FE in your 4Runner isn't about chasing peak dyno numbersit'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