what make a car 5.0 faster than another if they have same performance parts?

Try his car, like said above. You may not be as good as a driver, your motor mite be tired, tire presser doesnt help that much with street tires, now if you had slicks it would, but try running 30-35psi it may help a little but under that and street tires bow in the middle and you will loes trackson.