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Check this article out.

The pros and cons of modifying your car

Car customization is a booming business. Consumers spend billions every year on aftermarket parts. Still, many modifications can adversely affect vehicle performance, raising warranty, legal, and safety concerns.

Will the warranty be voided?
While modifications don't necessarily void a warranty, an alternation that causes vehicle malfunction or damage can void warranties for related parts. For example, some oversized wheel and tire combinations can strike against sheet metal and steering components and cause damage. In this case, the manufacturer is not responsible for the cost of repairs. A safe way to modify your vehicle without this worry is to buy modifications approved by the automaker.

Are the modifications legal?
Some engine modifications can violate federal and state emissions laws. The vehicle will be denied a smog certificate and registration renewal if an illegal part is found during inspection, regardless of whether the vehicle passes testing. All engine modification must have a California Air Resources Board (CARB) Executive Order number marked on the part of under the hood. All states recognize CARB-approved parts.

Are the modifications safe?
Well-chosen modifications can improve a vehicle's braking and handling, but safety can be compromised with improper installation or poor quality parts. Chassis and suspensions are designed as an integrated system for reliability and safety, and random modification may disrupt that system.

Lifting the suspension to clear large tires is a popular modification for 4WD trucks, but will result in a higher center of gravity and compromised stability, even at low speeds.

Plus-sizing wheels and tires can severely alter a vehicle's handling and braking force to stop, which can adversely affect the suspension dynamics. Thin sidewall tires may not meet load ratings for some large trucks and SUVs.

Even adding seat covers can affect safety if they interfere with seat-mounted side-impact air bags.

Is it worth it?
Lowered vehicles can have harsh ride and suffer from scraped fenders and rocker panels. Modified engines are often touchy and may require premium fuel. Performance brakes are often noisy, shed more dust, and require frequent pad replacement. Some body modifications require drilling or sheet-metal work that is expensive to reverse or repair. Finally, custom painting can be hard to touch-up and can "date" the vehicle.

Source, Consumers Report

432 Posts
It's so funny, the only thing I worry about is safety of my RAV. I honestly don't care if they're legal (they don't check here). Warranty is LONG gone. :lol: and hell for anyone that tries to cash in on it (lots of people here and in OZ know that one).

And who cares if anything I do to it, makes it harder to sell, or "dates" the car. I'm keeping it anyway. I won't give my hard work to some dumba$$ dealership, punk kid, or some old fart. This is my baby and mine only.

I think the only thing they are trying to do here is keep people from modifying their cars because the government is having a hell of a time either trying to find these illegal modifications, or trying to catch the drivers of the cars they can't catch.

I started in a good mood on this, and then got :evil:
In this country, its always don't do this, and then only do it our way, because our way is right. Did anyone see a pro of modification in this article? IMO this article is BS.

OK my rant is over now :p :lol:
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