On Thursday, Chevrolet came out swinging and announced the Corvette ZR1 and ZR1X both beat the Ford Mustang GTD’s Nürburgring lap time. It took less than two hours for Ford CEO Jim Farley to respond, “Congrats to the Corvette team. Game on,” he said.

Chevrolet’s Corvette ZR1X has dethroned the Ford Mustang GTD as the fastest American car, prompting a competitive response from Ford CEO Jim Farley.

The ZR1 accomplished that easily by setting a time of six minutes and 50.76 seconds, and the mighty ZR1X accomplished a time of six minutes and 49.275 seconds. Both the ZR1 and ZR1X were faster than the Ford Mustang GTD on the all-time list of Nürburgring production cars. Here’s the top 8 and their times: