my cars lowered and ive not had a problem. Try a preformance shop though, like shop simlar to SAT racing but in orlando. They are used to working on cars that have been lowered and wont have a problem with it.
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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.