This video is from the we site totalcarconcept.com. The tuning kit of Switzer P800 turns this Nissan GT-R in to a monster with amazing 800hp. With a few PSi more boost the 840 HP is no problem. They have additionally added 100 octane fuel in order to deliver better performance. Check the dyno run and acceleration of this Nissan GTR Switzer on the video:
Anyway, this McLaren will try to fight the tuned GTR, check it out!