Now when you say "increase the car performance" - yes it does. Electrical performance. Whether that translates into speed/torque/power I don't know. It really depends on the age of the car, how good is the ground, etc.
I was musing the idea of having a front end conversion for my sx and im quite taken in by ALL of the possibilities. All of em have a different but equally nice feel so its quite hard to decide (besides the price...