Firstly, yes i missed the Supercharger. Withthat in mind, he should easily dismiss any fcar or Lambo. I just read through the beginning part of his mods, thinking a supercharger would be first mentioned.
As far as the Gallardo, it is slower than the Diablos, although i do have roadtests as fast as 11.70. Their mph is slower than that of the Diablos.
As far as the Diablos running 13's, no thats not right. I was at Moroso in the early 90's when Car and Driver tested a bone stock 91 against an F40. The Diablo turned a 12.4@ 119. I have many articles showing low 12's. Problem with these cars, especially early tests is that they did not have factory demo cars, so magazines usually used privately owned cars, and most likely babied them.
But as stated, Mph is whats important in a street race, and most regardless of ET were clocked in the 120's, as high as 125. Also, dont let early Diablos fool you, properly tuned cars are among the fastest Diablos available.
As far as an F50, they are not very fast, they were a dissapointment even to die hard Ferrari fans.
As for the Ford Gt, that car is no joke!