What would they report to the authorities? That the owner modified his own car? As far as I am concerned once you paid for it you own it and can do whatever you please with it.
That is so not true. Vehicles have an operating permit / type approval issued by the authorities that state that certain requirements must be met. Eg: you must have seatbelts and (these days) airbags. Seatbelts made of string are not permitted.
You must have headlamps and taillamps of approved sizes, mounting locations, quantities and colours. Green taillamps and bright red headlamps are not permitted.
You must have doors that latch close, Doors made of cardboard held on with string are not permitted
You must meet certain crash criteria and safety standards. An array of poisoned spears pointing forward are not permitted.
You must meet emissions standards. A trail of oily black smoke obscuring vision of everyone behind you is not permitted.
So you see that you cannot modify a vehicle at whim and do whatever you like to it. There are certain parameters that the vehicle must fulfil at all times.
Sure, you can change the floormats and add a blanket to the back seat. But some things cannot be changed.
So Volvo are correct in saying that their vehicle is type-approved in the supplied configuration, and adding of features not approved for the configuration or for the country of use will actually invalidate the entire vehicle type approval.
That‘s how these things work.
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