1999-2003 Ford F-150 5.4L V8 Exhaust Manifold Racing Header GMC Exhaust Manifolds Cylinder Base Gasket: 12191-KCY-671

Cylinder Base Gasket: 12191-KCY-671

Tensioner Gasket: 12837-19B10

The models this kit fits are called "500" but the engine size is actually 493cc

2 x Pipe Fittings

2 * 1 / 4 "- 20x 1

1999-2003 Ford F-150 5.4L V8 Exhaust Manifold Racing Header GMC Exhaust Manifolds Cylinder Base Gasket: 12191-KCY-671Product 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