The current BMW M5 isn't what we'd call slow. Its 4.4-liter, twin-turbo V8 makes it the most powerful iteration yet. A 0 to 100 km/h time of 3.4 seconds should be fast enough for a lot of people too. Most of us would be happy if our car gets to that speed in less than ten seconds.

But, of course, some still think that's slow. BMW responded with the M5 Competition that has a more powerful version of its twin-turbo V8. But if that's still not enough, BMW's M5 CS might just satisfy those who want to chase down supercars in a four-door sedan.

2021 BMW M5 CS is (almost) as fast as a Ferrari F8 Trubito image

The 2021 M5 CS is the most powerful 5 Series to date. It's the most potent production BMW to date too. While it still uses the same 4.4-liter twin-turbo V8, the M Division managed to squeeze 35 more horsepower out of it. That means it now has 635 PS, which is also 10 PS more than the Competition model. Torque is the same as the standard M5 at 750 Nm.

2021 BMW M5 CS is (almost) as fast as a Ferrari F8 Trubito image

BMW also put the car on a diet. They chucked out the back seats in favor of a pair of lightweight carbon-fiber buckets. Sound deadening materials were reduced, and even the center console armrest was thrown out for good measure. According to BMW, the M5 CS is 70 kilograms lighter than the M5 Competition.

2021 BMW M5 CS is (almost) as fast as a Ferrari F8 Trubito image

Thanks to more power and less weight, the M5 CS shaves several tenths off the standard model's acceleration times. 0 to 100 km/h is down to 3.0 seconds, making it almost as fast as a Ferrari F8 Tributo (0 to 100 km/h: 2.9 seconds). But if that's not impressive enough, it can get to 200 km/h in 10.3 seconds. The top speed is limited to 305 km/h.

To reel in all that power, the M5 CS comes with an all-wheel-drive system like the “regular” M5. But for those feeling a little brave, it can revert to rear-wheel-drive with a push of a button. The suspension was also retuned to give it sharper handling and enhanced road-holding. Larger carbon-ceramic brakes are fitted to each corner of the car, and it wears Pirelli P Zero Corsa track tires for good measure.

2021 BMW M5 CS is (almost) as fast as a Ferrari F8 Trubito image

That said, there is still some resemblance of practically. After all, it is a four-door sedan. Even though it can't seat five anymore, there's still room in there for four people. As it's still a 5 Series, the trunk is still commodious, with 530 liters of cargo space available.

This is, perhaps, the most insane BMW M5 ever made. But if they want to dial up the insanity, they can put that engine, suspension bits, and weight-saving measures into a station wagon body. Now that's a recipe for the ultimate family car.