Blocking of smog ?
You will also need to put a blockoff plate on your EGR provision on the exhaust manifold (98-00 had EGR).
I would also yank the EVAP system.
Codes to delete:
EGR
AIR
EVAP
Rear O2
Fuel tank pressure
Etc.
You need to set them not set the code, not just not display the SES light. Some people set it to "No MIL", but it will still show on a scanner.

