Impala V6-3.9L (2007)
1. Install a NEW exhaust manifold gasket onto the cylinder head studs.
2. Install the exhaust manifold.
Notice: Refer to Fastener Notice.
3. Install the lower exhaust manifold bolts.
Tighten the bolts to 20 N.m (15 lb ft).
4. Install the catalytic converter.
5. Lower the vehicle.
6. Install the upper exhaust manifold bolts.
Tighten the bolts to 20 N.m (15 lb ft).
7. Install the exhaust crossover pipe to right exhaust manifold nuts.