I found this graphic of a 2.4Lts tuned Stilo floating around the Web:
Can't see power at wheel well but seems they calculated 73.7 HP loss at drive train.
A very flat torque curve, that's nice!
This makes that engine a pleasure to drive!
Τhe 73.7 HP loss that u mentioned is ENORMOUS!! The driver must have hit the brakes instead of letting the car roll down.