
Say hello again to this Evotech Stage 2 M6, packing 800 HP and not afraid to use them against a lesser opponent. In this case, a 550 HP Custom Stage 2 BMW M4.[...]
Source:
Carscoop
https://www.tuning-links.com/news_4724_Bimmer+on+Bimmer+Crime%3A+800+HP+M6+vs+550+HP+M4.html