I would be careful calling it the Porsche 962 considering that Porsche never made a road legal version of the 962 ALONE.
Daur made the "Daur 962 LeMans". I am also thinking that it is much the same case as the Ruf's in that it is a Daur not a Porsche. Personaly i think it IS a Porsche, i mean it uses a rear-mounted (well close enough) twin-turbo, flat-6, and Daur had ALOT of help from Porsche and based the entire thing on the 962 group C racer.
Undoubtably the quickest (round the track, and quite possibly in a straight line considering the wicked acceleration AND top speed) road legal car there is. The only exceptions i can forsee are purpose built racers, i doubt the Radical SR3 Turbo could beat it, but i don't think it's THAT far off (and for not TOO much over AUS$100,000 for it, it is a darn bargain).