From the article:
The vehicle testing in this video is a mule of the new 2016 Audi TT-RS being spied testing on the Nrburgring, Nordschleife. The exhausts tips are typical mule exhausts and the distinctive engine sound gives away that theres a 2.5 TFSI 5-cylinder with 270kW/367PS S-tronic under the bonnet, probably the same engine Audi is currently using in the 2015 Audi RS3 Sportback.

Photos and video - 2016 Audi TT-RS spied testing at Nurburgring