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15 Common Car Mods That Are Actually Illegal (Despite Being Pretty Cool)

The car modification market is alive and well. So says Market Data Forecast. According to the research firm, the global car modification market was worth $56.3 billion last year and is on pace to hit $58.23 billion this year and $76.73 billion by 2032.

Although some car mods are hideous monstrosities, some attract attention for all the right reasons. 

Not All Car Mods Are Legal

sports car with military camouflage decals
Editorial credit: Dawid Zawila / Shutterstock.com

One thing to keep in mind is that not all car modifications are legal. If you’re in a car mod frame of mind, do some research to determine whether or not what you want is legal. 

Keep reading to see 15 common car mods that, while illegal, are cool.

Underbody Neon Lights

neon underlights
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Have you ever seen a car with underflow? It’s a term for underbody neon lights. Although they look cool, they’re restricted and outright prohibited in some states as they can be a distraction.

Dark Window Tinting

Car with tinted windows
Image Credit: Motortion Films / Shutterstock.

If the tint is so dark that you can’t see into the vehicle even when close to it, it’s probably too dark. You could get a fine. Be sure to research tint darkness limits in your area.

Modified Exhaust Systems

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Aftermarket exhaust systems are an acquired taste. Some people hate them because they make vehicles too loud, while others believe the louder, the better. If you’re into them, be aware that modified exhaust setups may violate noise regulations and subject you to fines. It’s best to research before investing money in this mod.

Lift Kits

lifted Chevrolet Silverado High Country during SEMA Show Cruise
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Let’s be clear. Lift kits are not illegal per se. But if your vehicle’s lift kit is so high that it resembles a monster truck, it could be a problem. Check to see whether your state has lift kit restrictions so you don’t pour money into something illegal. The last thing you need is to be pulled over, fined, and forced to spend more money to reduce the lift.

Stretched Tires

mazda 3 Camber and stretched tires
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Even though they look impressive and distinctive, stretched tires are illegal. It involves mounting narrow tires onto big rims. Stretched tires give an aggressive look, but going this route can jeopardize safety. Given that some states have banned stretched tires, you’ll want to do some serious research before proceeding with this mod.

Headlight Modifications

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Modifying your headlights might seem like a good idea, but make sure you’re not violating any rules. Most states prohibit people from using red or blue headlights that look too much like the lights on emergency vehicles. 

Rolling Coal

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In the age of increasing environmental awareness, rolling coal is looked down upon. It refers to modifying a truck with a diesel engine, so it spews thick black smoke from the exhaust. Many states ban rolling coal, but it’s a head-turner.

Smoked Taillights

car wrapping smoke film tail light
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Smoked taillights can look cool. However, darkening your car’s taillights is forbidden in some places because it can reduce visibility and present safety risks.

Altered Suspension 

car with suspension lowered
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While some people love low-riders—vehicles with lowered suspensions—they’re illegal in some places. Vehicles with incredibly low suspensions can be unsafe to drive and compromise safety on the road.

Excessively Wide Wheels

large diameter custom wheel; wide wheels mounted on a car
Editorial credit: Doroznik / Shutterstock.com

You might also face fines if you’re out and about in a car with excessively wide wheels. Wheels that protrude substantially beyond fender lines are banned in some jurisdictions. But on the right car, they can look cool.

Spiked Lug Nuts

GMC Sierra HD Denali showing the passenger side, Spiked Lug Nuts
Editorial credit: Brandon Woyshnis / Shutterstock.com

Spiked lug nuts are a super-easy car mod. But they’re also super-illegal in some states. While they can give your vehicle an aggressive look on a budget, they can also pose a danger to others on the road.

Hydraulic Suspension

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Hydraulic suspensions are among the most impressive car mods. However, they can also violate movement and height regulations, which could result in a fine and hefty expenses.

License Plate Flipping Mechanisms

Technician changing car plate number in service center
Image Credit: Roman Zaiets / Shutterstock.com

You might not like the response from law enforcement if you install a license plate flipping mechanism. These car mods can be used to conceal license plate details, and that’s something the police won’t appreciate. The odds of you getting off with a warning are slim to none.

Loud Music Systems

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Some people blast their music too loud. If that sounds like you, a loud music system might seem like a good idea. But before investing in an expensive stereo, check the noise regulations in your area.

Exhaust Flame Kits

Tuned car show with flames coming out of the tailpipe at night
Editorial credit: Filippo Carlot / Shutterstock.com

Some motorists like the visual appeal of exhaust flame kits, but some states ban them due to safety concerns.

Although These Car Mods Are Illegal, They are Cool Nonetheless

sport car with a custom body kit parked on street
Editorial credit: Doroznik / Shutterstock.com

If any of these car mods interest you, do your research before spending time and money installing them. Otherwise, focus on car mods that won’t get you into trouble.

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