For a 1979 Ford F150 with an aftermarket open-style air filter instead of a TAC, what is the inspection result?

In the context of vehicle inspections, especially regarding emissions and overall vehicle compliance, the presence of an aftermarket open-style air filter can significantly affect the vehicle's performance and emissions output. The Texas Department of Public Safety (DPS) mandates that vehicles conform to specific standards based on their original manufacturer's specifications.

For a 1979 Ford F150, the original equipment would have included a factory air intake system designed to meet emissions standards of that time. Replacing this with an aftermarket open-style air filter typically does not comply with the original emissions regulations, as these filters can allow excessive airflow and may inadvertently increase harmful emissions. Such modifications could also impact vehicle performance and might not provide adequate filtration compared to the original equipment.

Given these considerations, the inspection result would be a failure because the vehicle no longer meets the standards set for its original configuration. Technically, a vehicle must not only perform well but also adhere to environmental regulations, and using non-compliant aftermarket parts generally results in a failing grade during an inspection. This ensures that vehicles contribute to the overall health of the environment and comply with regulatory expectations, reinforcing the importance of using appropriate components in vehicle modifications.