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Warranty is what, 3/36. Just thinking here, I want to mod my car, intake, exhaust and tune, which will probably void warranty, but what will go wrong that it will matter. Cars today are made pretty well aren’t they? The probability of needing warranty work is pretty slim isin’t it? I cannot imagine waiting 3 years before I do these mods, am I really risking a huge bill for something failing, what would be likely to fail?

And if what I do does cause the fail, well then them the brakes, you play you pay.
 

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If the dealer can prove that the modification you did caused the malfunction that would be covered under warranty, they can refuse to service it under warranty. They would have a hard time proving that your aftermarket body kit, for example, caused compression loss in your engine. It's their burden of proof, if they don't have proof, then they would much rather honor the warranty then have a lawsuit on their hands. Intake, exhaust and tune wouldn't outright void the whole warranty, but anything that could be caused by those could be refused coverage, but they would still have to prove your mods caused the issue.
 

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If the dealer can prove that the modification you did caused the malfunction that would be covered under warranty, they can refuse to service it under warranty. They would have a hard time proving that your aftermarket body kit, for example, caused compression loss in your engine. It's their burden of proof, if they don't have proof, then they would much rather honor the warranty then have a lawsuit on their hands. Intake, exhaust and tune wouldn't outright void the whole warranty, but anything that could be caused by those could be refused coverage, but they would still have to prove your mods caused the issue.
That is a correct statement of law. Well presented @Paul Mafinga! What do we realistically do if our dealer says, "sorry Charlie," you mod caused this problem and we are not going to repair X which failed as a result or your mod (even though we totally disagree with that assessment)?

Our first step would be to appeal our dealer's decision to someone higher up in Mazda world. But what if we do and that "Mazda appeal" person also says, "sorry Charlie," then what do we do? Start with hiring attorneys and/or automotive specialists to try and win a lawsuit. All costs are now on us if we do not eventually succeed. So if the repair from your mod would be a $475 item, how quickly do we get to that amount in attorney's costs? OR, we instead choose to not pursue an attorney/law suit process and just pay the $475 to have that part replaced?

As @Paul Mafinga so correctly noted, your changes of a "related or downstream" part failure as a result of your unrelated mod are slim, especially with cat backs, aero kits and similar. However, when we start to deal with significant intake mods, tuning our motors, and similar, the odds of a "Mazda warranty denial" quickly move away from "slim."

We each get to choose our level of financial risk versus our mod benefit rewards, but just because the law is on our side, we still need to individually decide what we are comfortable with. I do not even have my Mazda 3, and already have a mod list of 26 things I am going to do on it. It will not involve tuning it -- though I have many friends who start motor tuning within weeks of their getting their new cars. My mod list will involve many things other than tuning my motor.

Love that we each get to make informed decisions as to our mods vs. potential consequences.
 

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I've had mine all of 5 days and I've already created a Nav SD card (cost me 12 bucks), Modded the infotainment system (a little, more to come I'm sure) and I have been planning my de-badge/re-badge. I would have already been messing with the engine tune if my current software (HPTuners) supported Mazda. I have a history of voiding warrantys day 1. Knock on wood, I've never been denied service despite my best efforts to void the crap outa that thing.
 
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