What type of vehicle modifications require inspection or re-approval from the TLC?

Modifications that alter safety features or emissions systems require inspection or re-approval from the TLC because they have a direct impact on the safety of the vehicle and compliance with environmental regulations. These changes may affect the vehicle's ability to operate safely on the road or adhere to the emissions standards set by regulatory agencies. Ensuring that such modifications are approved helps maintain a standard of safety for passengers and other road users while also protecting environmental standards.

While enhancements to fuel efficiency and improvements to aesthetics may provide benefits, they do not typically have the same significant implications for safety or compliance. Therefore, they do not require the same level of scrutiny or inspection. Each type of modification is assessed based on its potential impact on the vehicle's performance, safety, and regulatory compliance. This ensures that vehicles remain safe to operate and meet legal requirements after any modifications are made.