Manifold – Gm (25534394)

Manifold is part of the exhaust or intake path and affects both flow and emissions compliance. Internal substrate or channel design determines performance, and an equivalent-looking unit with a different core will not meet the same calibration.

Replace the Manifold when an efficiency code is set, when the unit rattles from a broken substrate, or when the body has rusted through. Check the mounting and the sensors that feed it before condemning the unit.

Ordering reference for the Manifold is part number 25534394, categorised under Throttle Bodies & Intake. Match that number against the component you are removing before you order.

The stock here is genuine GM, and this Manifold keeps the original engineering number, which matters once a number has been superseded more than once.