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Ships within 48 hours · Estimated delivery Aug 23 - Aug 28
12191-035-000
Piston: 3402-846
56020038AD
Unlike restrictive factory exhaust manifolds
piston: 90602-MBN-670
2007-2013 GMC Sierra 1500 4.8L 5.3L 6.0L 6.2L Stainless Steel Exhaust Manifold Headers 402 12191-035-000Product 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
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