Sounds like you'll need to remove the pipe from the manifold.
The exhaust valves are smaller and lead to the exhaust manifold.
Ignition timing is off.
V-8s are on the drivers side in front of the exhaust manifold.
The intake & exhaust manifold must be removed. Then the head must must be removed. A very difficult repair and not a repair a novice should attempt.
It is located on the front edge of the drivers side head, right above the exhaust manifold.
On driver side of block by the bolt in exhaust manifold closest to front of vehicle
On a 2007 Duramax engine, the EGR (Exhaust Gas Recirculation) valve is typically located on the driver's side of the engine, near the rear of the cylinder head. It is connected to the intake manifold and the exhaust system. Accessing it may require removing other components, so refer to the vehicle’s service manual for detailed instructions.
The exhaust manifold needs to have a gasket in place to help seal the juncture between the manifold and the engine. After the gasket and gasket sealer are in place, tighten the bolts for the exhaust manifold. The exhaust pipe can then be replaced on the new exhaust manifold.
The purpose of the exhaust manifold is to connect the exhaust ports on the cylinder head to the exhaust pipe.
exhaust manifold is where exhaust pipe hooks to engine!
In the exhaust manifold behind the engine.In the exhaust manifold behind the engine.
That will be the passenger side head. Look at where the exhaust pipe bolts to the exhaust manifold and it will be the first 02 sensor you see starting there and moving down the exhaust pipe.