That's a blanket statement, and wrong. Ferrari doesn't allow unlicensed modifications of their cars.
You are able to customize many vehicles to your liking. And just like you can choose the options before sale, you're free to replace one official part with another official part after sale as well.
From what I can tell, this is limited to rims, tires, brakes, seats, passenger display, and other similar configuration options, though.
Search for "3000hp lambo" on youtube and you'll see what modification actually means.
We're talking about using one intel-certified part with another intel-certified part using intel-certified default settings.
- If I buy parts that are certified to work together, and I use them according to their respective manuals, they should work as specified.
- If I desire to manually change or customise something, I should be able to modify whatever I'd like.
- As soon as my changes go outside the certified range, I'm liable myself. But as long as I'm within of the certified range, warranty should still apply and the product should continue working as specified.