The Infernus is in fact the fastest car in GTA IV at 250km/h, with the Comet second fastest at 248km/h, but in TBoGT, the fastest car (availabe only in multiplayer) is the fastest, with a top speed of 260km/h. In addition, What is the fastest car in GTA 4?
There is no cheat code to spawn the Infernus, but Brucie will give one to you as a gift during the story. In GTA 4, the Infernus vehicle is actually a Lamborghini.
