The Moss-Magnuson act is a federal law which basically outlines your rights as a consumer regarding product warranties. So how does it effect adding aftermarket mods to your Elantra? Read ahead:

Federal law sets forth requirements for warranties and contains a number of provisions to prevent vehicle manufacturers, dealers and others from unjustly denying warranty coverage. With regard to aftermarket parts, the spirit of the law is that warranty coverage cannot be denied simply because such parts are present on the vehicle, or have been used. The warranty coverage can be denied only if the aftermarket part caused the malfunction or damage for which warranty coverage is sought. Disputes in this area usually boil down to arguments over facts and technical opinions, rather than arguments over interpretations of the law.

So does this law mean that my warranty cannot be denied no matter what mods I've done? No. Dealers and manufacturers will still deny if they can show the part cause something to fail. No doubt they will probably fight most mods. But the law is the law and it it clearly states aftermarkets parts cannot cause you to lose warranty coverage of themselves.

[b]Here's the full text of the law[/b]...