Which statement is true about aftermarket catalytic converters?

Aftermarket catalytic converters are devices designed to reduce the emissions of harmful gases from a vehicle's exhaust system. The statement regarding their installation on vehicles on or after January 1, 2009, is particularly noteworthy, as this date marks significant regulatory changes concerning emissions standards.

Vehicles manufactured after this date must adhere to stricter emissions standards enforced by the California Air Resources Board (CARB) and the Environmental Protection Agency (EPA). Therefore, any aftermarket catalytic converter installed on these newer vehicles needs to be compliant with these regulations to ensure the vehicle maintains its emissions certification. This compliance is crucial because improperly certified catalytic converters can result in increased emissions and potential penalties for vehicle owners.

In contrast, vehicles manufactured prior to this date may have different emissions requirements and could allow for a broader range of aftermarket catalytic converters, but these do not necessarily guarantee adherence to the newer standards. So while options discussing pre-2009 vehicles might have merit regarding aftermarket options, the key point is the importance of proper certification and compliance for vehicles manufactured on or after January 1, 2009.