
It's always fun to watch two direct rivals go head to head and see who's better at accelerating in a straight line. It's even better when both cars are heavily modified.[...]
Source:
Carscoop
https://www.tuning-links.com/news_4614_Heavily+Tuned+BMW+M5+%26+Audi+RS6+Duke+It+Out+From+A+Rolling+Start.html