You dont need any of that, you can also remove your flux capacitor, your blinker fluid pump and 710 fluid pump. All that will give you 20hp once it is removed.
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Driving definitions: Understeer is when you hit the wall with the front of the car and Oversteer is when you hit the wall with the rear of the car. Horsepower is how fast you hit the wall and Torque is how far you take the wall with you.