What is the correct inspection procedure for a vehicle equipped with aftermarket headers?

• A. Check to see if there is a CARB EO number for the headers.
• B. Pass the vehicle with headers installed.
• C. Ignore the header issue and proceed.
• D. Replace headers with stock and retest.

Answer: (B)

Testing the vehicle with the installed hardware reflects real-world emissions performance. If the car is equipped with aftermarket headers, the inspection should be conducted with those headers in place so the readings show how the vehicle actually runs. The goal is to determine whether the vehicle meets emissions standards under its current setup; removing the headers just for the test would misrepresent its true performance. If the emissions readings are within limits while the headers are installed, the vehicle passes the inspection. Verifying that the headers are legally approved (for example, checking a CARB EO number) is a separate due-diligence step that may be required, but the primary procedure described here is to evaluate the car as it sits and pass if it complies.