Hello, in the Virtual Arsenal the sirens are optional components.

There is only one motorboat class with three different skin (camouflage) types: civilian, police and rescue

All three skin types can be combined with police light bars and "rescue boat"/"police" signs as components (hideable)

I think, this is intended.

Yeh, the thing that throw me off, was that the civilian version hat the light bars. I guess that's due to the fact that skin selection (doors etc.) is not yet implemented.

Civilian version should no longer have sirens.