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They have to prove that your claim was in relation to your "upgrade/tune" in order to deny warranty.
They can't say that your tire went flat because of a tune or upgrade. On the other hand, if you show up with a major misfire and you have a tune, I can see them rejecting your warranty on THAT issue.
Also, there are products out there that state that their product "won't interfere with your warranty". The small print says - "if you don't install it". Figure that out. IT isn't unlawful to sell a product, but if you install or use it, you are liable. Always read fine print.
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