If you want to make a car fast. Especially lambo fast. You can't start out with the slowest version they made of the car..... the 3100 should have never been put in GP's it's extremely underpowered. A 3800 will actually get better mileage than a 3100 because the 3100 gets lugged down so much. I'm not trying to rip on you here but without doing a swap to something else your car is only good for a DD