Here it is, then: the 2021 BMW M3 Competition. With 510hp from its 3.0-litre twin-turbo straight six, it's the most powerful M3 ever made. But those after four doors, four seats, more than 500hp and an auto 'box are already well served by the latest Alfa Giulia Quadrifoglio. Can the rear-drive M3 really be better than the best sports saloon out there? Dan went to Wales to find out...

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Read the 2021 BMW M3 Competition review here:
https://www.pistonheads.com/news/ph-d...

Read the Alfa Romeo Giulia Quadrifoglio review here:
https://www.pistonheads.com/news/ph-d...

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