Turbonetics New H3 Turbo System

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Well, if the dealer never contacts GM, the warranty will not be voided. Dealers cannot void a warranty since GM is the actual issuer of the warranty. GM looks for the dealer to notify them of these type of modifications.
Another way is for them to cover the cost themselves, but this causes problems if your vehicle needs to be serviced out of town.
The third option is if GM supports a SC or TC via their dealer accessory network, at which point GM is warranting the SC or TC and the powertrain warranty stays in effect.

But, any addition like a SC or a TC, will void the actual GM powertrain warranty (other items not affected by the addition will still be warrantied). And before anyone mentions the Moss-Magnuson warranty act...please; GM has one great record of winning these types of lawsuits, and the onus is on the person who had it installed to file the suit or file for arbitration.