More on the warranty:
Your warranty does not "void" unless there is a specific clause stating that a certain act will void it. Putting aftermarket parts on your vechicle does not "void" it. The warranty still exists in it's original form and you can still have items repaired at the cost of the warranty.
However, if you have a problem and the dealer can determine that a non-OEM part is the cause of your problem (and likely have to prove it), then that specific repair will no be covered under the warranty. You will have to pay for the repairs for this one problem. The warranty remains intact and the same as it was before this repair. Nothing is voided.
The source of the warranty law:
MAGNUSON MOSS WARRANTY ACT
US Code - Title 15, Chapter 50, Sections 2301-2312
Legally, a vehicle manufacturer cannot void the warranty on a vehicle due to an aftermarket part unless they can prove that the aftermarket part caused or contributed to the failure in the vehicle (per the Magnuson Moss Warranty Act (15 U.S.C. 2302(C)) . For best results, consider working with performance-oriented dealerships with a proven history of working with customers. If your vehicle manufacturer fails to honor emission/warranty claims, contact EPA at (202) 260-2080 or
www.epa.gov. If federal warranty protection is denied, contact the FTC at (202) 326-3128 or
www.ftc.gov.