Will installing aftermarket products void my factory warranty?

Many consumers are confused if the aftermarket products installed on their vehicles will void the factory warranty. The answer is simply, no. A dealer cannot void your vehicle warranty only because an aftermarket part has been installed in your car.
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Federal Trade Commission Consumer Information 

If you were being unfairly denied warranty coverage in the past, there is recourse. The Federal Trade Commission, which administers the Magnuson-Moss Warranty Act, monitors compliance with warranty issues. Direct complaints to the FTC can be made at (202) 326-3128.