A big mistake — they forgot to demonstrate the
«ahooga» air horn in this trailer

. You can hear it in the stream at 51:32.
Personally for me, it’s the most prominent part of this DLC

. Can’t say I am a huge fan of the visual components like those glowing logos, big spotlights or old school steering wheels (older school than we have in
Steering Creations DLC for
ATS) in sparkly plastic texture, but they are very popular in modding since the earliest years of this game.