Impala V8-5.3L (2008)
3. Install a NEW exhaust manifold pipe gasket (1), if equipped with RPO LS4.
4. Install a NEW exhaust manifold pipe gasket (2), if equipped with RPOs LZE/LZ9.
5. Install the catalytic converter. Refer to Catalytic Converter Replacement (LS4) (See: Catalytic Converter/Service and Repair)Catalytic Converter
Replacement (RPOs LZE/LZ4/LZ8) (See: Catalytic Converter/Service and Repair) .