How about 0-60mph in 3.5 secs with a stock 2.5L ?
Presently I am adding SVT breathing and a Nitrous kit to make things a little more interesting, along with launch & traction control to put more power down. Hopefully this will slash another 0.5 sec off and bring it to below 3 seconds!

Only difference is my car is a mid engine GT and only weighs 700kg. Ok so I cheated