What Are the Legal Modification Scopes for Vehicles in 2021?

2 Answers
Doreen
07/28/25 5:28pm
2021 legal vehicle modification scopes are as follows: Vehicle Appearance: Mainly includes methods such as changing the body color or applying body wraps. The vehicle must undergo color change registration at the DMV within 10 days after the modification, with new license photos taken and the vehicle license replaced. However, three specific colors are prohibited: fire engine red (R03 bright red), administrative law enforcement vehicle color (white top with blue bottom), and engineering rescue yellow. Bumpers: Front and rear bumpers are highly important components of a vehicle, and modifications must not alter the vehicle's length or width. Wheels: When modifying wheels, it's crucial to note that the size of the rims cannot be changed, as altering rim size affects the vehicle's power and performance, constituting an illegal modification. However, replacing rims of the same size is permitted. Chassis Suspension: Chassis suspension is another common modification project. Strictly speaking, chassis modifications are typically chosen by owners with high demands on vehicle performance. Enhancing chassis rigidity significantly improves handling performance. Normally, modifications involving chassis suspension can pass annual inspections. Suspension modifications include replacing shock absorbers, reinforcing suspension structural components, and enhancing body rigidity, with shock absorbers being the primary factor affecting the modification project.
Was this review help?
10
0
Share
LeEmma
08/11/25 9:35pm
Last year, I modified my car by changing the body color from silver to blue and adding some personalized wraps. I followed the regulations and went to the DMV for registration, which went smoothly. Legal modifications mainly cover the exterior, such as changing the rims, but they must maintain the original factory size. For the interior, seats and steering wheels can be upgraded, but safety devices cannot be removed. Performance modifications should be approached with caution—only minor changes like replacing the air filter are allowed. Modifying the engine or exhaust to increase noise is strictly illegal. Lighting upgrades are permitted; LED lights are fine as long as their brightness and color comply with regulations and aren’t glaring. When driving, always remember to register major modifications; otherwise, you might fail the annual inspection or face fines. Overall, modifications can make your car more unique, but safety comes first—avoid overly extreme changes.
Was this review help?
9
1
Share
Expand All
More Forum Discussions

How often should the GAC Trumpchi GS4 be serviced?

Here are the maintenance intervals for the GS4 at different mileage points: 1. The first service is free, including oil and oil filter replacement, along with inspections of relevant components. Note that if the vehicle does not undergo the first service at the authorized dealer within the specified time, the warranty rights will be forfeited; 2. The regular maintenance interval for the GS4 is every 3 months or 5,000 kilometers, consistent with most vehicle models; 3. Replace the oil and oil filter every 5,000 kilometers, the air filter, cabin air filter, and coolant every 20,000 kilometers, the fuel filter every 10,000 kilometers, the manual transmission fluid and spark plugs every 50,000 kilometers, the brake fluid every 40,000 kilometers, and the timing chain every 80,000 kilometers.
8
2
Share

How to Open and Replace the Battery in a Baojun Car Key?

Baojun car key battery replacement steps are as follows: 1. Locate the plastic button on the head of the car key, pry it open, and then remove the metal mechanical key. 2. Use the metal mechanical key or a flat-head screwdriver to pry open the plastic casing of the car key. 3. Open the plastic casing. 4. Replace with a new battery and reassemble the car key by reversing the disassembly steps. Below is additional information about car keys: The car keys available in the market come in various types, mainly including mechanical and electronic keys. Mechanical car keys are the most traditional and widely used type, featuring relatively simple functions with only lock and unlock buttons. Electronic car keys are a newer type of key with more functions.
18
5
Share

What are the two mileage readings on the dashboard?

The two mileage readings on the dashboard are the total mileage and the trip mileage. Total mileage: Refers to the distance traveled by the car since it left the factory. Trip mileage: The trip mileage can be reset to zero. It can be used to calculate the distance of a specific route or to measure how many kilometers a full tank of fuel can cover. Press and hold the button to reset it. Odometer adjustment, commonly referred to as "clocking": Adjustment means modifying; the meter is a device that measures a certain quantity. Clocking refers to the process where a skilled operator manually or with the help of specialized equipment modifies the current displayed or recorded value of the meter. Besides having basic hands-on skills, adjusting a car's odometer requires understanding and mastering its working principles, and specialized equipment is needed to modify the mileage count.
11
2
Share

What is the difference between China 6a and 6b?

The differences between China 6a and 6b: 1. Different carbon monoxide emissions: The emission standard for carbon monoxide in China 6a is 700 milligrams per kilometer; in China 6b, it is 500 milligrams per kilometer. 2. Different non-methane hydrocarbon emissions: The emission standard for non-methane hydrocarbons in China 6a is 68 milligrams per kilometer; in China 6b, it is 35 milligrams per kilometer. 3. Different nitrogen oxide emissions: The emission standard for nitrogen oxides in China 6a is 60 milligrams per kilometer; in China 6b, it is 35 milligrams per kilometer. China 6 refers to the National Sixth Stage Motor Vehicle Pollutant Emission Standard, which is divided into two phases: 'China 6a' and 'China 6b'.
4
0
Share

What engine does the Cadillac CT6 use?

This vehicle is equipped with two engines in total, one is a 2.0-liter turbocharged engine, and the other is a 3.0-liter twin-turbocharged engine. The following is a detailed introduction to the engines: 1. The 2.0-liter turbocharged engine has a maximum power of 177 kW, a maximum torque of 350 Nm, a maximum power speed of 5000 rpm, and a maximum torque speed of 1500 to 4000 rpm. This engine is equipped with variable valve management technology and uses an aluminum alloy cylinder head and block; 2. The 3.0-liter twin-turbocharged engine has a maximum power of 298 kW, a maximum torque of 543 Nm, a maximum power speed of 5500 rpm, and a maximum torque speed of 2500 to 5000 rpm.
10
1
Share

How to Set One-Touch Window Control for Haval M6?

To activate the one-touch window control, simply pull the window button to its topmost position. Currently, most mid-range vehicle models are equipped with this feature for convenient operation, preventing driver distraction during window adjustment and enhancing driving safety. Below are details about the one-touch window control function: 1. This feature is implemented via a window regulator, which prevents theft of items inside the car due to forgotten open windows. 2. It can be categorized into time-controlled and program-controlled intelligent window-closing systems. The installation of time-controlled automatic window closers is relatively complex, while program-controlled ones share similar control principles with time-controlled types but are prone to operational errors, lack precision, and are more susceptible to malfunctions. 3. Utilizing the one-touch window control function reduces driver distraction caused by window adjustments during driving, ensuring safer vehicle operation.
9
1
Share
Cookie
Cookie Settings
© 2025 Servanan International Pte. Ltd.