Legal car modifications include the following: 1. Replacing wheels of the same size: Wheels can be replaced without altering the vehicle's length, width, or main structure, but the wheel size must match the original factory specifications and must not extend beyond the fenders. 2. Changing the vehicle's color: National laws allow individuals to change their vehicle's color. However, if the color change covers more than 30% of the body, you must visit the DMV within 10 days to take new photos and apply for the modification. Additionally, you cannot use colors reserved for official vehicles (such as police cars, fire trucks, ambulances) or reflective or "chameleon" colors. 3. Installing a roof rack: The installed roof rack must not alter the vehicle's length, width, or main structure. The height of the rack must not exceed 30 cm, and it must be securely fastened. 4. Adding side steps: Side steps can be installed, but they must not change the vehicle's length, width, or main structure. 5. Replacing the grille or bumper: Modifications to the grille or bumper are allowed as long as they do not alter the vehicle's length or width. 6. Interior modifications: Interior modifications are more lenient compared to exterior changes. Examples include installing carbon fiber trim, an Alcantara steering wheel, upgrading the audio system, or adding leather seats. 7. Modifying headlights: As long as the color is not changed, the color temperature is below 6000K, and the headlights use bi-xenon projectors without glare issues that could affect other drivers, the modification is legal and will pass annual inspections. 8. Upgrading the braking system: This includes replacing performance brake pads, rotors, or even calipers. Upgrading the braking system within reasonable limits not only enhances appearance but also significantly reduces braking distance and improves pedal feel.
