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