December 2, 2022


Creating a higher standard

What Accessories Can I Legally Add To My Car In The United States

What Car Customisations and Modifications Can You Legally Make? | Simoniz

For many people, their ideal car design does not exist on the market. It’s often said that your vehicle is a reflection of your personality, so it’s no surprise that people often seek to add modifications to their cars after purchase to personalize them. These changes to a vehicle after purchase are called “aftermarket” meaning they are not factory installed. 

Aftermarket modifications are now more popular than ever. Car owners make all kinds of changes to purchased cars to increase aesthetic and performance and while you have the leeway to customize your car as you please, some modifications may prove unsafe to you and other road users and may get you slapped with a ticket.

19 US states require annual vehicle inspections and most other states also demand car owners test the legality of their cars often and this is partly due to the government trying to stay on top of illegal aftermarket modifications. So if you’re not familiar with car modification, you might be surprised to hear that some changes to your car’s aesthetic and function can land you in hot water with the law. 

However, what changes can you make that are legal? 

Before we begin, check out Adrenaline Offroad for some great aftermarket companies. 

Legal Car Modifications

  1. Lowered suspensions

Lowered or heightened car suspension is legal as long as you stay within your state rules for vehicle height. A good suspension can improve your driving experience and fine-tune your car to fit the way you drive and what kinds of roads you use. 

However, before getting a lowered or heightened suspension you should consider a few factors like speed bumps in your area, MOT safety, and the auto rules and regulations in your state. 

  1. Tinted windows

Tinted windows are probably the most popular aftermarket modifications and they’re perfectly legal too. They add aesthetic value to vehicles and help shield drivers and passengers from the sun among many other uses. While it’s fine to tint the rear windows and the rear windscreen, some restrictions apply to tinting the front windows and windscreen.

Auto law states that at least 75% light must be able to get through the front windscreen and 70% light for the front windows. This is to make sure your view isn’t obstructed.  

 If you want to tint your windows or make any other changes make sure you do it with a reputable company Check out ReviewBirds for some customer -favorite brands.

  1. Seats

Seats are also common aftermarket changes to cars. There are many reasons why a car owner may want seat upgrades but a common one is people wanting to change their car into race cars and original seats are not always comfortable and supportive for sports. Racing with a car without aftermarket modifications is a common reason for accidents, so getting some seat modifications is sometimes necessary and it’s totally legal as well.


If you’re considering purchasing a vehicle with aftermarket modifications it is important to know the rules and regulations surrounding aftermarket changes. Make sure you get your modifications from reputable businesses and also check out for insurance of modified vehicles.