Think the current M5 and M8 Competition are fast? Apparently M GmbH is working on an even punchier V8 engine, but it's a couple of years away.
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BMW could have a more powerful twin-turbo V8 engine to play with in 2021, according to new reports from Europe.

BMW Blog reports the 'S68' V8 engine is between two and three years away, and will be a significant upgrade over the current 'S63' engine powering the M5 and M8 ranges, along with a smatter of M Performance models.

The new engine "will still be a twin-turbo setup and it will keep the ‘hot V’ configuration alive too", the report claims.

"However, it could be smaller in size and, most importantly, it could feature some electrification on the side."

At the moment, the engine is a 4.4-litre unit pumping out 441kW and 750Nm. In the M8 Competition, it's good for a 100km/h sprint time of just 3.2 seconds.

Although it's not 100 per cent clear yet, the report suggests the new engine could be used to power a lighter, more focused M5 variant – potentially badged the M5 CS – as its first application.