The Furai being an LMP2 class race car- LMP stands for Le Mans Prototype and the designation 2 is given to car that's not as powerful/fast as LMP1 (Peugeot 908, Audi R10/15/18)- not only is light but also sits lower than most production derived race cars i.e. GT race cars (Corvette C6R, Audi R8 LMS etc.). What that will provide is a lower center of gravity giving the car incredible stability around corners. On top of that LMP2 class cars have better aerodynamic than most GT class cars (with the exception of Super GT GT500) which result in a good amount of donwforce.
So with low weight plus balance/stability and downforce, even a slightly underpowered race cars can be quite fast.
