Five worst car modifications of all time

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Since the advent of the wheel, there have been those among us who feel the need to take the design one step further. Some do it for speed, some for handling, and some simply for style.

The result? Vehicles fitted with neon underglows, spinners and headlight eyelashes, to name a few. Install the wrong optional extras, though, and it could be a crime of more than bad taste.

Certain modifications may be deemed illegal by your state authority, so it pays to check before you drive. Other car mods made without your car insurer’s consent could void your policy, while some can put a dent in future resale value or even turn away potential buyers.

So before you install that turbo dump valve read this guide by auto research firm Glass’s Guide to learn what not to do to your car.

DIY extras

Topping the list of aftermarket no-nos is fitting DIY extras, such as stereos and speakers. The Guide found that dodgy home-installation jobs caused a car's resale value to plummet.

Bad alloys

While hotter rims and tyres may appeal to you, they may not appeal to your car insurance company, who may have conditions relating to vehicle modifications, so it pays to check before you have them fitted to your car.

It also pays to check with the road traffic authority in your state, as altering your rims and tyres beyond certain limits is illegal.

Colour crimes

Similarly, unusual car colours such as shades of yellow, orange and green are not as popular as traditional colours, and can make a vehicle more difficult to sell. As can some interior fabrics, such as fancy or expensive leather trim – data reveals that these add no more to the value than a basic full leather option, but often cost significantly more upfront.

Over the top features

Fancy climate control systems can also be money for jam, according to the study. While standard air conditioning was found to boost a car's value, extras such as zone control might be nice, but adds no extra value.


Even expensive extras paid for in the showroom and installed by the experts may be not be covered by your comprehensive car insurance policy, unless you specify at the time of taking up the cover. Car insurance policies can differ dramatically in what is covered and also in price, that’s why it’s so important to compare policies and read the product disclosures before signing up.

It’s also part of your duty of disclosure to tell your provider immediately when you decide to make modifications to your car. If you don’t, by law your provider may reduce or refuse your claim or cancel your policy.