The Ohio based tuning company Switzer Performance has topped their previous records with the Nissan GT-R P900. This modified Nissan GT-R now produces 900hp with an all new transmission to handle the power.
Also, the P900 runs on E85(Ethanol) while there is another variant of the Switzer's kit which is known as the R850 which runs on racing fuel.
@F1: I can't seem to find the video of the AMS GT-R against the Veyron. If you can find it, do post it. The video you posted has insane acceleration, but I doubt it can beat a Veyron.