Execution sequence
1. We install the car on a viewing ditch or overpass (see «Preparing the car for maintenance and repair»).
2. Disconnect the exhaust pipe from the exhaust manifold (see «Downpipe - replacement»).
3. On the Astra model, with a 10 mm wrench, unscrew the nut securing the negative wire of the engine...
...and disconnect the wire.
4. Disconnect the exhaust manifold from the cylinder head (see «Exhaust manifold - gasket replacement»).
5. Remove the manifold from the engine compartment.
6. Install the parts in reverse order.
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