Cayenne S (9PA) V8-4.5L (2003)
4. Remove wheel.
5. Remove front wheel housing liner.
6. Remove main catalytic converter.
7. Using a mirror, remove the fastening screw on the catalytic converter holder -lower right arrow-.
8. Remove three fastening nuts between the exhaust manifold and starter catalyst.
9. Leave the oxygen sensor cable exposed and remove the starter catalyst in a downward direction. Remove flange seal.
Installing Starter Catalyst on Cylinder Bank 5 - 8
Removing And Installing Starter Catalyst