Java Programming

I have an Object I want to modify.
I'd like to put a wrapper class around it.
so I can keep the current object + just modify the data returned from it.

Say I have a Car Object and I want to create a Pimped wrapper class.
I can make a PimpedCar Class that extends Car and takes the original Car as a param in its constructor.

public class CarPimper extends Car{
   private Car carToPimp;
   public PimpedCar( Car car){carToPimp = car;} 
   public Image getImage( ){
      Image carImage = carToPimp.getImage();
      addSpeedStripes( carImage );
      return carImage;
   } 
   public int getNumWheels( ){return carToPimp.getNumWheels();}
   private void addSpeedStripes( Image image){
      //whatevers needed
   } 
}

To code this way I have to override every method in Car and eithor just return the data from the same method for carToPimp or adapt the data before I return it.
This is all very well except that some of the methods I want to override + call are final. So I can't override them.
I guess it's poor that my Car Object is not an interface, but thats somthing that I can't change.
So I'm stuck - is there any other way for me to do this?