one thing i know for sure is that they can't void for having a differnet intake or exhaust, since it doesn't come from mazdaspeeed. The Act says that you are not required to use their specific product.
"Tie-In Sales" Provisions
Generally, tie-in sales provisions are not allowed. Such a provision would require a purchaser of the warranted product to buy an item or service from a particular company to use with the warranted product in order to be eligible to receive a remedy under the warranty. The following are examples of prohibited tie-in sales provisions.
In order to keep your new Plenum Brand Vacuum Cleaner warranty in effect, you must use genuine Plenum Brand Filter Bags. Failure to have scheduled maintenance performed, at your expense, by the Great American Maintenance Company, Inc., voids this warranty.
Total non-sense...using a different product than the manufacturer sells is almost exactly the reason that they void warranties...
Listen if you put an exhaust and intake on your car and the engine blows do you really think they are going to put every exhaustive effort into finding out if the problem was caused by something else other than you fiddling with it? NOPE! They will see immediately that it is not stock and do everything in their power to NOT have to pay for it. You might say that "oh well we investigated this and the engine blew because of something malfunctioning in the fuel system", but they are going to come right back at you and say "well it broke because you added performance parts that caused higher horsepower which in turned taxed the fuel system causing the problem".
The "Act" was written by politicians to make modders stop crying about warranty issues, but it was made so vague that we all get ****** anyways...Who do you think politicians intended to protect with that act? Consumers who might have a case using this act once in awhile...or the Dealerships who have loads of money in their pockets for political contributions?
This topic has been done to death and yet NO ONE has ever come on to a thread and say they benefited from this Act and I doubt there is anyone out there that has (or very few at least)...If someone can show me some concrete examples that would be great, but instead we have 90 page threads of people "denying until they die" that this act is "protecting them" and that they can mod whatever they want...which is bull...In the end the dealer is GOING to screw you.
People are forgetting the biggest loophole in this MAgnusson crap is this:
The car was engineered by some of the smartest people on the planet. The dealerships offer a warranty based on this very principle, that the countries smartest minds built these cars. You, the consumer, are lucky to even be smart enough to have a GED...Who the hell are you to say that by putting an intake on a car you are not endangering the car and therefore voiding the warranty? YOU ARE NOT SMART ENOUGH TO KNOW WHAT GOES INTO ENGINEERING A CAR JUST BECAUSE YOU WATCHED FAST AND THE FURIOUS.
You could not even comprehend all the math and engineering that goes into these vehicles....and even if you are right that your "mod" didnt break your car...they know enough math to convince a judge and jury that you did break it! Aesthetic mods are one thing, but performance mods are a totally different thing.