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20 Car Mods That Are Illegal In The United States

Some of the most popular modifications are also very illegal

The Fast and the Furious isn't just one of the most exciting film franchises of all time. It also introduced the weird and wonderful world of car modifications to the larger American public, most of whom thought that “car modifications” meant adding a bumper sticker.

Many thousands of young men and women spend countless dollars on upgrades and modifications to their vehicles in order to improve how they look or how they perform or even how they sound before parading them at meets and races with other car enthusiasts.

The global market for car modifications is expected to reach $522 billion USD by the year 2022 as more and more people look to put their own personal stamp on their vehicles. It is worth remembering that it isn’t just the cost of the modification that you have to take into consideration, as some of these embellishments can actually increase the cost of your auto insurance premium!

Some of the most popular modifications are also very illegal as they can make it difficult to drive the vehicle safely or can boost the performance of the car so much that it becomes dangerous.

Just to make things even more complicated, different states have different rules about which modifications are allowed, so you always need to check the rules relating to the modifications on the list below before you start any cross-country road trip.

Here are 20 car modifications that are illegal in the United States.

20 Studded Tires In Good Weather

Via youtube.com

In times of bad weather, studded snow tires can be a life saver. In some areas they are even mandatory (or at the very least strongly recommended) when roads are icy and snowy.

However, some motorists view studded tires as a cosmetic modification, something to make their cars look a little cooler rather than something which could save their lives.

Indeed, when the weather isn’t bad, studded tires can themselves pose a danger as they can easily skid on dry road surfaces.

This is why many states where studded tires are a common sight in winter have to impose rules forbidding their use during warmer months. Washington state between November and March is one example. Other states have banned the use of metal studs in favor of the rubber variety.

19 Light Rig On The Roof Of A Truck

Via hidlights.cc

A lot of people who own trucks also like to pretend that they use those trucks for journeys far more demanding than the school run or the morning commute. We’ve all seen truck drivers who have spent as much cash upgrading their pride and joy as any Fast and Furious inspired street racer.

One of the staunch favorites of truck owners is a light rig on the roof in order to provide extra bright illumination for those after dark off-roading trips.

It is worth being aware that some states have restrictions about the use or even the installation of such lighting rigs. In 2017, for example, North Carolina passed a law prohibiting the use of these rigs while driving on state highways, as they can distract and even dazzle other road users.

18 Radar Detectors

Via caranddriver.com

Radar detectors are devices installed in cars which tell the drivers when their speed is being measured by radar guns used by law enforcement; a handy toy if you like driving above the speed limit without the risk of being given one of those pesky traffic citations.

Speed limits are there for a reason, as are the law enforcement officers who are using radar guns to check the speed of vehicles: to keep all road users safe.

That is why these are illegal in all vehicles in Virginia and Washington DC, and are illegal in commercial vehicles in Illinois, New York and New Jersey. While radar detectors are legal in Minnesota and California, you are not allowed to fix them to your windscreen, where they may cause an obstruction while driving.

17 Obnoxiously Loud, Throaty Engine Roars

Via youtube.com

All vehicles are sold with a muffler on their exhaust system to control noise levels. While it is generally illegal to remove them, you can always add new modifications if you want your car to have one of those obnoxiously loud, throaty engine roars.

Again, different states have different laws when it comes to how loud your exhaust is allowed to be. Texas, for example, has no vehicle noise rules at all, which means that anything goes when it comes to engine noise.

In California, the limit is 95 decibels while Kansas law states that noise from car engines has to be less than 90 decibels when measured from a distance of 50 feet. Come cities, including New York, even have their own local laws on engine noise.

16 Neon Lights

Via neonlaws.com

One of the other popular modifications which makes regular appearances in The Fast the Furious films are the neon lights which boy racers put on the underside of their vehicles. While this may look cool, it doesn’t have any impact on the performance of the vehicle, so why on earth would any state have a problem with a bit of extra funky lighting?

Because that extra funky lighting can be a distraction to yourself and to other drivers, that's why.

Arizona allows neon lights, but only amber or white lights on the side of the car. Kansas doesn’t allow you to use flashing lights. Michigan also has restrictions on neon lights with red and blue lights banned altogether. Maybe that's because other drivers mistake them for the lights on a police car.

15 Exhaust Pipes With Emissions

Via autostopltd.com

The trend these days among most motorists is to drive increasingly environmentally friendly cars. You just have to look at the success of hybrids to see how attitudes to pollution from motoring is changing.

The Environment Protection Agency has rules about what emissions are allowed from the exhaust pipes of engines which still rely on good old fashioned petrol, yet there are mods on the market which can affect the amount and type of emissions which are expelled from your exhaust, and can easily lead you to run afoul of the law.

New cars are all sold with devices which control the emissions from your car but if you want to remove them to change the appearance or performance of your vehicle, then you could be open to prosecution under the Clean Air Act.

14 High Suspension

Via bds-suspension.com

Making changes to your car’s suspension is one of the more common modifications, whether it by increasing or decreasing the distance between your car’s bodywork and the road.

Truck owners are particularly keen on lifting the suspension of their vehicles, but this can make the truck difficult to handle and a potential danger on the roads as well as causing long term damage to the suspension!

If you want to lift your suspension or drive through a different state with a high suspension which is legal at home, check what the local rules are before you make any decisions. Connecticut, for example, only allows vehicle owners to life their suspension by a maximum of four inches, while in Georgia the limit is a two inch increase on the original dimensions.

13 Very Low Suspension

Via pinterest.co.uk

There are some car owners who want to lower the suspension of their vehicle to improve its appearance and its handling as well as reduce drag so that you can achieve faster speeds. There’s a reason all those cars in The Fast and the Furious look like they’re hugging the tarmac!

There are risks associated with a lower suspension including the fact that your car could end up getting damaged by the first speed bump you drive over, and some states have restrictions on how low vehicle suspensions can be.

Georgia’s two inch restriction also applies to lowered suspensions, while in New Hampshire no part of the vehicle’s bodywork or chassis can be lowered so that it lies below the lowest part of the car’s wheels.

12 Coloured LED Bulbs In Headlights

Via 5series.net

Neons are far from the only light-based modification you can make to your car. You can even jazz up your headlamps, tail lights or indicators with LED lights using different colors and effects to make them look more eye-catching. Or can you?

As far as the law is concerned, many of the same restrictions often apply to LED highlights as apply to LED neons on the underside of your car.

Kentucky has become one of the most recent states to pass a law banning the use of colored LED bulbs in headlights, not only because they are distracting to other drivers, but because if they are installed incorrectly it can be difficult to control the beam which can lead to oncoming drivers being dazzled by your disco headlamps.

11 Brighter HID Bulbs In Your Headlamps

Via powerbulbs.com

While you may think that you are being a conscientious road user by installing brighter HID bulbs in your headlamps, you could be pulled over for breaking the law. HID stands for high intensity discharge and these 55 watt lights – compared to the 35 watts you get from normal headlamp bulbs – give off a much brighter, bluish-white light.

Some drivers think that it helps them to be better drivers at night, but it certainly doesn’t help anyone coming in the other direction if you've forgotten to dim your lights!

HID lights don’t comply with Federal rules on headlamp bulbs which state that replacements must match the specification of the original equipment. HID lights work differently to the halogen bulbs which all cars have when they roll off the production line.

10 Nitrous Oxide Systems

Via techrasta.com

The Fast and The Furious also brought the existence of nitrous oxide as fuel to a whole new audience, with racers using it to give themselves a much needed boost in street races.

Nitrous Oxide Systems, or NOS as it is referred to by those in the know, would seem to be part and parcel of any street racer’s modifications package, but it’s use is illegal in many parts of the US.

Ohio has some of the strictest laws regarding the use of NOS. When you buy nitrous oxide there, you have to sign a form declaring that you know it is illegal to use it in a car. Sellers are also required to keep names on file of people who have bought the gas for two years after the sale.

9 Plate Frames

Via optimaforums.com

Lots of people like to personalize their vehicles in some way so that it reflects their own style and even their own personality. This can range from getting a new paint job in your favorite color to something as simple as slapping on a bumper sticker to let fellow drivers know how proud you are of your kids or how you voted in the last election.

You can even buy decorative frames to put around your license plate. You would do this to reflect your love of Disney or Star Wars, for example.

Who could object to that, right? Most states will tolerate these frames so long as they don’t obscure the state of origin or the number, but North Carolina has banned plate frames altogether for vehicles registered in-state.

8 Rolling Coal

Via inverse.com

If Environment Protection Agency rules prevent car owners from removing the emissions controls devices from their car, then you can be sure that the EPA will definitely frown upon the phenomenon known as rolling coal.

This is a modification made by the owners of diesel cars and trucks which sees more fuel taken into the engine than necessary so that huge rolling black clouds are produced by the exhaust.

It may look impressive, but environmentally friendly is is not! The EPA has deemed the practice illegal and states such as Illinois, New Jersey, Colorado and Maryland have passed their own laws banning the modification itself from being made and imposing fines on anyone who is caught on the roads belching black diesel smoke from their trucks.

7 Special Covers For License Plates

Via nypost.com

While the motorists who get punished for using decorative license plate frames might rightly feel aggrieved at being fined for such a simple cosmetic change, the same cannot be said for those drivers who very deliberately use special covers for their license plates in a bid to beat speed cameras as well as those used at bridges and tunnels to charge tolls.

New York City has thousands of cameras and the practice of using plastic covers to deflect light and prevent cameras from reading the license plate is also widespread even though it is illegal in the state.

In fact, it is so widespread that even NYPD and city employees have been caught using the illegal scam! Most states have laws which say license plates must be fully visible, and any infraction can be punished with a fine.

6 Extremely Loud Stereo Systems

Via lifewire.com

Loud engines aren’t the only car modifications that can break laws designed to control noise pollution. Even with today’s high-end car entertainment systems, many drivers feel that their stereo systems need an upgrade so that they can enjoy their favorite tunes at top volume while they’re motoring.

Of course, they forget that if the volume is turned right up inside the car, then people outside the car can also hear it!

Most states have laws against noise pollution, especially in residential neighborhoods at night – though Florida recently dismissed an old law which stated that music was too loud if it could be heard 25 feet away as unconstitutional.

There is nothing to stop you upgrading your car stereo anyway, so long as you are prepared to keep that volume dial turned down!

5 Radar And Laser Jammers

Via mlive.com

You'll remember that radar detectors are used by many drivers to inform them when they are being monitored by law enforcement, but radar and laser jammers go one step further by actually blocking the signals emitted by police devices so that they can’t even register your speed in the first place.

Radar jammers are completely illegal under Federal law because of FCC regulations on the use of unregulated radio signals, and the use of them can lead to a fine or even a prison sentence wherever you live in the US.

Laser jammers are a bit more of a grey area under Federal law, though they have been ruled illegal under state law in California, Colorado, Illinois, Texas, Virginia and Washington DC among others.

4 Tinting On The Rear Windscreen And Side Windows

Via alfordmustangs.com

Once upon a time tinted windows were the preserve of celebrities trying to protect themselves from the glare of the paparazzi, but it seems that these days even us ordinary citizens demand the protection of tinted windows on our vehicles.

Tinting on the rear windscreen and side windows can in many cases be so dark that it poses a safety hazard, especially in bad weather when your visibility is already reduced.

All the states have different limits when it comes to how much tinting can be applied to side and rear windows. If yours are deemed to be dark then you could find yourself pulled over by local cops. In Alaska, for example, tinting must allow 70% light transmittance on side windows in the front, and 40% in the rear.

3 Front Windscreen Tinting

Via pistonheads.com

Amazingly, some drivers even seem to think it’s a good idea to have tinting on their windscreens despite the obvious safety hazard.

A few inches of tinting at the top of the windscreen actually does help drivers by preventing them from being dazzled by low sunlight, but states also have their own rules about whether any windscreen tinting is allowed at all, and if so, what restrictions are applied.

Most states forbid windscreen tinting apart from the top five or sometimes six inches to help with driving in sunlight.

In Colorado, Rhode Island and North Dakota you can tint the whole of your windscreen so long as it allows 70% light transmittance. The only exceptions to this ban are people who have light-sensitive medical conditions.

2 Muffler Delete

Via northamericanmotoring.com

Most drivers pay very little attention to their car's exhaust pipe unless it’s belching out clouds of smoke or falling off. However, some drivers will do anything to make their exhaust look and sound better, including installing a straight pipe exhaust otherwise known as a muffler delete.

This modification removes the almost cylindrical muffler so that your exhaust pipe – or even pipes if you want to double up for effect – look more straight and streamlined.

Because mufflers have a role to play in controlling traffic noise, some states don’t allow this particular modification. Minnesota state law, for example, states that “Every motor vehicle shall at all times be equipped with a muffler in good working order.” Get rid of yours, and you’re breaking the law.

1 Cold Air Intake

Via roto-fab.com

Cold air intake is an advanced engine modification which can be illegal in California if it doesn’t have the appropriate certification because it affects the emissions from the car’s exhaust.

Any modifications which have an impact on the vehicle’s factory settings emissions levels are forbidden in the Golden State, which takes its commitment to cutting pollution and protecting the environment very seriously.

If your cold air intake isn’t stamped with a CARB EO exemption number then you’re breaking the law.

If you are determined to get cold air intake installed in order to increase power and improve your miles-per-gallon stats, you can pay extra for good quality parts which have been approved by the state as maintaining or even improving the factory standard emissions levels.

Sources: www.fastandfurious.com, www.dmv.org, www.radarbusters.com,

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20 Car Mods That Are Illegal In The United States