Typically a warranty as a whole isn't voided, but a claim can be denied. For the claim to be denied, it's denial must be reasonably linked to some modification made outside the terms of the warranty (or use of a car in an improper or expressly forbidden manner etc.). You can supercharge your motor and if the your fratistat modulator fails because it was poorly made, then the dealership has to replace it (assuming it is otherwise under the terms of the warranty). Now, it you are running an insane amount of boost and your engine atomizes then of course your claim can be rightly denied.
The problem is that dealerships are staffed by folks that know cars and not law. They often say things like "a tune will void your warranty" or "that exhaust will void your warranty" and believe it, but they are often wrong.
So, prudence in modification and claims are key. Just because you're denied coverage initially, doesn't mean it is the last word. If you are unsure about your coverage, do at leat two things; read the specific coverage for your specific vehicle and bone-up on consumer protection law with a little reading. It will keep you from getting surprised (or making dumb mods with unreasonable expectations) and it will enable you to preserve your rights to the maximum extent possible should you need to make a claim.
You are reading this on the internet. Only 0.1% of what you read on the internet has a congruence with a vague similarity of an approximation to some semblance of reality. Keep that in mind.
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