I have an 00 Z28 with long tube headers and am trying to get it to pass inspection here in NC. However, I have three "NOT READY" codes when they try and inspect my car and you are only allowed to have 2 and be able to pass. I have cleared all the codes from the computer so the SES light is not on and I obviously know why the cat conv and o2 sensor heater are showing "NOT READY" but what I am trying to figure out is why the Evap is saying "NOT READY". Any help on answering question or suggestions as to how to fix my problem would be greatly appreciated.