The horny one
Brass instruments create sound through air vibrations in a tubular resonator. Common brass instruments include the trumpet, french horn, trombone, euphonium, and tuba.
Whatever they could fit in a trunk and thats it..
A couple of things could fit that description. Cornet, flugelhorn, French horn all come to mind. A cornet and flugel horn play exactly like a trumpet. A French horn is is normally in a different key than a trumpet.
relay, probably under the instrument panel
It could fit, but it will be loose.
Yes. Most people with cars today are thinking of changing their current horn to a truck horn by simply putting the horn at the back part of their car.
A dragon does not fit because it does not have a horn.
PUT IT IN YOUR BACK SEAT.
A sousaphone is portable. It's bell can be removed by loosening three screws that fasten it to the rest of the horn. The rest of the tubing can then fit around the bell and the entire horn can fit into a small, but heavy case.
Many types of ceratopsians would fit this description. The most famous is Triceratops.
I would suggest that you start at your local musical instruments dealer.
To fit a horn to your Rover 220, first locate the horn mounting position, usually near the front of the vehicle, behind the grille or in the engine bay. Disconnect the battery to avoid any electrical issues, then remove the old horn if necessary. Attach the new horn using the provided bracket and secure it with bolts, ensuring the electrical connections are properly made. Finally, reconnect the battery and test the horn to ensure it functions correctly.