Remote Car Starters, Wheels, Tint

In the US it is unlawful to restrict consumers from purchasing ad-on accessories and customizing to their cars. Customizing has been around since Henry Ford decided all FORDS would be BLACK and customers wanted to have special options. Here is th FEDERAL LAW on this:
Magnuson-Moss Warranty Act of the United States
Under the Federal Magnuson-Moss Warranty Act of the United States Code Annotated Title 15 Commerce and Trade Chapter 50 Consumer Product Warranties Section 2302(c), and the general principles of the Federal Trade Commission Act, a vehicle manufacturer or dealer may not make its vehicle warranty conditional on the use of any after market system unless the manufacturer provides the system free of charge or the Federal Trade Commission (FTC) has given the warrantor a waiver for this section of the law or specifically published that only the vehicle manufacturer’s product may be used.
In laymen terms, this means that NO vehicle manufacturer or dealer may make conditional its warranty because you installed an aftermarket product on the vehicle. The Federal Trade Commission (202-326-3128) administers the Magnusson-Moss Warranty Act and monitors compliance with warranty law. The Magnusson-Moss Warranty Act is viable all States regardless, however some states may have additional consumer protect laws, please consult you local consumer protect offices for more details.