Best bet is buy a used mid pipe with cats like a factory take off from ebay or these board and install it for the inspection. Should be a few bolts I guess, nothing major really. Then when you are done put yours back on. Just make sure to clear the code once you put stock pipes on so the check engine light goes away. And yes, mil eliminators would be a great idea on the o/r pipe once you put it back on. It's bad to always have the MIL light on bc you may think its only the o2 light when there could be other codes that have ben thrown as well and you don't find out.