1997-1999 Oldsmobile Aurora 4.0L Exhaust Manifold 4 Cyl W/ Heat Shield 674-509 yy2210B Includes a ductile cast iron

Includes a ductile cast iron Y-pipe for superior strength under high-temperature conditions

For Chevrolet Silverado 2500 HD 2001-2013

Bore Size: STD 91 mm

Includes 5/8” 6Ft 100% silicone reinforced hose made for oil systems

2 * 1 / 4 "- 20x 1

1997-1999 Oldsmobile Aurora 4.0L Exhaust Manifold 4 Cyl W/ Heat Shield 674-509 yy2210B Includes a ductile cast ironProduct 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