Yes. Customizing a car is completely legal--as long as the vehicle still adheres to the law. There are limitations, such as engine output, tire size, window tinting, body shaping, lights, and exhaust systems (both in carbon emissions and noise). For instance, you cannot drive a car around town that has been stripped and converted into a race car--it won’t have mufflers, turn signals, lights, and many basic components that make a car street legal. Know the laws and limitations before going all-in on customizing your rig.