The M340i is deceptively fast. If you think that was an issue with the S4/S5, it’s even more of an issue with the BMW.
But for very different reasons.
Because the Audi’s feel so planted with how Quattro is tuned as well as the sound deadening and isolation, going 70mph around a curve feels like going 45mph.
BMW’s xDrive is more rear biased and feels more playful on the backend. However the throttle and transmission mapping in every mode except Sports Plus is extremely linear and smooth for a high performance car. That means you can smoothly accelerate to 80+ mph without feeling like it unlike in the Audi which has more abrupt changes at each gear shift in sport mode. Don’t get me wrong, the BMW also pushes you back in your seat, but you don’t have to modulate your gas pedal inputs as much and it just keeps on pulling without the same level of feedback.
It’s almost like the BMW is trying to replicate how you would accelerate in a manual car with smoother gas pedal inputs vs an auto where you can modulate the gas pedal in pulses a lot more to get the output you want. Hard to describe accurately.
Very risky for your ability to legally drive.