McLaren first envisioned the Senna GTR as a concept car, which it trotted out at the Geneva Motor Show last spring. The British automaker has said it only intends to build 75 examples, and each will cost around $1.4 million. That'll buy the lucky owners at least 813 horsepower and 2,200 pounds of downforce. A lot of dramatic carbon fiber bodywork helps it perform that aerodynamic feat. As McLaren Automotive CEO Mike Flewitt has said, the GTR will offer "more power, more grip and more downforce ... than the McLaren Senna and post even faster lap times."
The prototype we see in the spy shots above looks incomplete, so expect to see more aero bits as development continues. It has a more aggressive stance, with wider fenders to match its wider track. We'll be curious to hear more details from McLaren closer to the car's production launch late next year, but seeing the Senna GTR hit the track is certainly a thing to behold.