The SSC Ultimate Aero 8T which also ironically is the fastest production car in the world. Unless of course you wanna count the Bugatti Veyron as it has a V8 engine. It just has...two of them...
1. SSC Ultimate Aero: 257 mph, 0-60 in 2.7 secs. Twin-Turbo V8 Engine with 1183 hp, base price is $654,400. Tested in March 2007 by Guinness world records, The SSC Ultimate Aero takes the lead as the fastest car in the world beating Bugatti Veyron.