1999-2003 Ford F-150 5.4L V8 Exhaust Manifold Racing Header GMC Exhaust Manifolds 3L 2000-2006

3L 2000-2006

Tensioner Gasket: 12837-19B10

CNC-machined from aircraft-grade 6061-T6 aluminum for strength and precision

Cast pistons feature a high silicone content for added strength and durability

Cylinder Base Gasket: 12191-KCY-671

1999-2003 Ford F-150 5.4L V8 Exhaust Manifold Racing Header GMC Exhaust Manifolds 3L 2000-2006Product Overview: 1. Exhaust headers are a key upgrade for boosting engine performance by improving airflow. Unlike restrictive factory exhaust manifolds, performance headers give each cylinder its own dedicated exhaust path, reducing back pressure and improving exhaust flow. 2. By minimizing exhaust interference between cylinders, headers help increase horsepower and torque. When paired with a high performance cold air intake and a cat back exhaust