Grand Marshall limousine - Engine sound?

Just a very simple question.

Just fired up BeamNG for the 1st time in ages and saw the new option where I could follow a route around town and drive the Grand Marshall Limousine.
Now...... This may be due to my lack or personal understanding of engine types and/or car types.
But I was constantly struck, and continually put off by the sound of the engine coming from this "Luxury Limo"
It sounds more like a Beefy custom truck with minimal exhaust that a high end limo.

I know the BeamNG team are of course very particular about things being realistic when it comes to many aspects of each vehicle.
So is it just me?
Do I not understand how a Limo should sound? (smooth and silky I would image)
The current Beefy Engine really breaks the immersion belief for me.

Can anyone explain please?