Will a truck pass smog with an electric cut out?

An electric cutout, commonly known as an exhaust cutout or bypass, is a device installed in a vehicle's exhaust system. With the flip of a switch, it allows the driver to bypass the muffler or other components of the exhaust system, usually resulting in a louder, more aggressive exhaust sound.

In terms of smog check regulations, the presence of an electric cutout can affect the vehicle's emission control system. In many jurisdictions, it is required to have a fully functional emission control system in place for a vehicle to pass a smog check. An electric cutout, by allowing unfiltered exhaust gases to bypass emission control devices like catalytic converters, could lead to higher levels of pollutants being emitted from the vehicle.

Depending on the specific regulations and inspection procedures in your area, an electric cutout may cause a vehicle to fail a smog check. It is recommended to consult with local emissions regulations or contact a smog check station to determine whether an electric cutout is permissible and will impact the vehicle's ability to pass inspection.

To ensure successful passing of a smog check, it is advisable to keep the vehicle's exhaust system in a stock configuration, without any modifications or aftermarket parts that may alter its emissions characteristics.