Shorty Headers for Nissan Armada Pathfinder Titan Infiniti QX56 (2004-2015) 5.6L

High-Flow Shorty Headers for 2004-2015 Nissan, Infiniti Armada, Pathfinder, Titan, QX56

Direct Bolt-On Exhaust Upgrade: Replaces the restrictive cast-iron factory exhaust manifolds on the VK56DE to reduce exhaust backpressure, improve cylinder scavenging, and increase overall horsepower and towing torque.

The Stock VK56DE Exhaust Shortcoming

The factory cast-iron exhaust manifolds equipped on the 2004-2015 Nissan and Infiniti 5.6L V8 models are notoriously restrictive and prone to structural failure. Built primarily for mass-production cost savings and stringent emissions packaging, the OEM manifolds suffer from poor internal airflow dynamics. The rough cast internals create significant turbulence, leading to excessive exhaust backpressure and elevated exhaust gas temperatures (EGTs) near the cylinder head. Over time, these extreme, localized heat cycles cause the factory cast iron to warp or crack. This inevitably results in audible exhaust leaks, compromised oxygen sensor readings, degraded fuel trims, and noticeable losses in low-end towing torque.

The Engineering Solution

These Flowtech upgraded shorty headers resolve the inherent flow limitations of the stock VK56DE cast manifolds by utilizing precision 1-5/8-inch mandrel-bent primary tubes. Mandrel bending ensures the inner diameter of the tubing remains entirely consistent through every curve, eliminating the turbulent pinch points found in the factory units. This optimized tubular geometry significantly improves exhaust gas velocity and cylinder scavenging, allowing the 5.6L engine to breathe efficiently. At the cylinder head interface, the headers utilize 3/8-inch thick laser-cut steel flanges to ensure a completely flat, warp-resistant mating surface. This robust flange design prevents the dreaded exhaust leaks common to these trucks, maintaining structural integrity even under heavy towing loads. The system includes premium-quality replacement gaskets to ensure a reliable, long-lasting seal upon installation.

Technical Specifications

Compatibility

• 2004-2015 Nissan Armada (5.6L V8)
• 2004-2015 Nissan Pathfinder (5.6L V8)
• 2004-2015 Nissan Titan (5.6L V8)
• 2004-2015 Infiniti QX56 (5.6L V8)

The Nissan Truck Durability Standard

Designed for the rigorous demands of half-ton towing and off-road payload capacities, these shorty headers provide the thermal stability, leak-free reliability, and low-end torque required to maximize the utility of your VK56DE-powered truck or SUV.