How to Install a Spoiler Without Violating the Law?
2 Answers
Generally, installing a small spoiler is not illegal after approval from the vehicle management department. Detailed Explanation: Installing a spoiler alters the appearance of a car and requires approval from the vehicle management department to be legal. Small spoilers, commonly referred to as "ducktail spoilers," can usually be approved by the vehicle management department. Any modifications to the vehicle body must undergo approval from the vehicle management department; only after approval is granted will the modification be considered legal. Otherwise, it constitutes unauthorized vehicle modification, which is illegal and may also prevent the vehicle from passing annual inspections. Choose a Smaller Spoiler: When installing a spoiler on a car, opt for a smaller type that can be attached to the trunk lid without the need for strong adhesives. These spoilers are less noticeable and do not require modifications to the car's bumper or other parts, making them relatively safer compared to other types of spoilers.
To avoid breaking the law when adding a rear spoiler, the key is to comply with traffic regulations and vehicle management rules. Last time I helped my friend modify his car, we first checked the local DMV policies, which state that aftermarket parts must meet original equipment dimensions and aerodynamic standards, and cannot protrude excessively from the body—otherwise it counts as illegal modification. When I did it myself, I chose an OEM-certified spoiler under 10cm in height, and immediately completed the modification registration after installation, so police inspections wouldn't cause issues. Don't neglect safety either—an improperly installed spoiler may cause loss of control at high speeds, so professional installation is recommended. Similar procedures apply for adding lights or wheels—skip the process and risk fines, impoundment, or failed inspections. The bottom line: research regulations beforehand, complete the paperwork, then enjoy legal modification.
