During a private trackday of McLaren, I have filmed a $3 million McLaren P1 GTR undergoing through testing on the famous F1 circuit, Spa Francorchamps. This GTR is the ultimate track-going version of the McLaren P1 and is the competitor for the Ferrari LaFerrari FXX K. The sound was just EPIC in person, probably even better than the P1!Liked the video? Click the 'like' button, comment, and subscribe!Follow me:Subscribe: http://www.YouTube.com/GUMBALFACEBOOK: http://www.fb.com/GUMBALTVINSTAGRAM: http://www.instagram.com/GUMBALTVTWITTER: http://Twitter.com/GUMBALTVhttp://www.gumbal.tv