1999-2004 Pontiac Montana 3.4L Exhaust Manifold 4 Cyl W/ Heat Shield 674-509 NEW2310 CNC precision-machined from high-quality aluminum

CNC precision-machined from high-quality aluminum for a perfect fit

All joints are TIG welded to enhance strength and prevent cracking

For 2005-2007

00mm with a 17mm steel piston pin

For 1997-2000 Acura EL

1999-2004 Pontiac Montana 3.4L Exhaust Manifold 4 Cyl W/ Heat Shield 674-509 NEW2310 CNC precision-machined from high-quality aluminumProduct 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