Thanks for the video @kezo Unfortunately it’s the pre facelift model, which is a different engine setup. Following the 2023 facelift, the all engine variants are now mated with a mild hybrid setup and different emissions setup, which has changed the noise of the cars. Added to that, the 40d doesn’t have the BMW Sport Exhaust system unless you opt for the Pro pack. The car in the video does. As with diesel BMWs that I’ve had, you can tell it’s a diesel from outside in that video, but inside I suspect that you wouldn’t be able to tell, as @BigDave reports.
The change is even more stark in the V8 version. The pre facelift version (M50i) had a BMW ‘N’ series V8 engine (non-M version) and owners of the X5M (which had an M Division ‘S’ series engine) complained that the M50i had louder exhaust crackles and pops than the full fat X5M! Following the facelift the replacement M60i (which I’m testing this week) now has an M Division S series V8 but mated with a mild hybrid system and is apparently muted compared to the previous M50i. As a result, now the M60i owners aren’t happy!