What Mods void warranty?

[Fish]

I hate to go back on topic and answer the OPs question, but a dealer can void specific parts of the warranty. I was told by a Pontiac dealer they can void your powertrain warranty if they find a 180 tstat in your engine. It all depends on the dealer.

[SyntheticShield]

I hate to go back on topic and answer the OPs question, but a dealer can void specific parts of the warranty. I was told by a Pontiac dealer they can void your powertrain warranty if they find a 180 tstat in your engine. It all depends on the dealer.

Not legally.