In one word, no.
Interior and exterior mods generally don't void the warranty. They could though. For example if your engine overheats and pops when you have an aftermarket front bumper that restricted airflow to the radiator. They might argue that was the cause for it blowing up. That is a huge stretch though... I wouldn't really worry about this. Careful with the seats if they have airbags.. just be sensible when modifying things that could affect the expensive bits of the car.
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