Has the Porsche Taycan's brother-from-another-mother - the Audi RS e-tron GT - come into the super saloon class and ripped up the rulebook entirely? To find out, here's Chris Harris testing it against the very car that invented the class, the BMW M5. And it's not your boggo £102,000 BMW M5 Competition. No, it's the £140,000 BMW M5 CS with extra horsepower and bronze trim. Which car sparks more joy for you? Subscribe to Top Gear for more videos: http://bit.ly/SubscribeToTopGear WATCH MORE TOP GEAR: Top Gear Series 29: http://bit.ly/TGS29​​ Geneva Online Motor Show: http://bit​.ly/TGGMS20​ First Look: http://bit.ly/TG-FirstLook MORE ABOUT TOP GEAR: Want to watch a bit of Top Gear on the internet? Welcome to the most comprehensive collection of official clips you'll find on YouTube. Whether you're searching for a caravan challenge, Ken Block in the Hoonicorn, cars versus fighter jets, Stig power laps or the latest Chris Harris Drives, you can find all the iconic films here. Want to share your views with the team? Join our BBC Studios Voice: https://www.bbcstudiosvoice.com/register This is a commercial channel from BBC Studios. Service & Feedback https://www.bbcstudios.com/contact/contact-us/