As of right now theres not real bolt on turbo kit. Every conversion ive heard about was a custom job. Also the N/A engine cant handle the boost that a turbo engine can. Your better off getting a TII engine.
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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.