The Magnuson-Moss Warranty Act

Have you been told that modifying your car by adding after market products, like a custom exhaust system, will void the warranty?  Here are 5 things you should know about The Magnuson-Moss Warranty Act, the federal law that protects you from bad warranties.

  1. The Magnuson-Moss Warranty Act (or Lemon Law) Was Passed To Protect Consumers From Deceptive Warranty Practices. The law covers implied and written warranties, and service agreements.
  2. Modifications Do Not Automatically Void Warranties. A common misconception is that aftermarket add-ons (AME) automatically void warranties. In fact, a warranty that states, implies or is used to support this is illegal.  That doesn’t mean you can just modify away, but it does mean that a dealership refusing to fix your warrantied windshield wipers after you replaced your exhaust system with chrome is either misinformed or trying to get one by you.
  3. The Only Way To Void A Section Of A Warranty Through Modification Is If The Aftermarket Equipment Causes The Problem. A dealer or other service provider cannot void or refuse to honor a warranty simply because you’ve added some aftermarket items – he must be able to prove that these AMEs (Aftermarket Equipment) caused the problem.  And saying it is not the same as proving it.
  4. The Law Does Not Vary From State To State. The Act is federal law which means even if you file suit in state court there isn’t a difference in the application of the law.
  5. A Warranty Cannot Stipulate Brand. Warranties can be voided due to all kinds of things: misuses, damage, deliberate lack of maintenance. What they can’t do is say you must use x brand of muffler in your vehicle.  In fact, the only way they can do this is to provide the product to you, and install/replace it, free of charge.


Exhaust Systems Direct provides quality AME to customers and strongly suggests having a professional install them.

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