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Wow...everyone seems to think this.
According to the magnusson-moss warranty act, it is against federal law to void a warranty due to aftermarket accessories!!! They can NOT simply void your warranty!
However, they do NOT have to cover damage covered by unauthorized aftermarket accessories...so if you install a tuner and break your truck with it, it's on you.
That being said, if it's unrelated to your tuner they HAVE to cover it.
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