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The Jaos one does not require any drilling...it simply mounts on with clamps and comes with a Third brake light cover...all you need to do is to connect the new LED third brake light and your set. I could post pics of it later if you need them.
Correct, and it doesn't use any of the holes from the stock one, meaning, you don't have to have a stock delfector beforehand to put on the Jaos.
People mainly by them for looks, but it does help keep the grime off the rear window a bit. Also, when you are driving over 100 mph, it will give extra downforce.
Jason B, It would give an upforce cause the airflow is directed down, lifting the back. It would have to have the trailing edge up for it to push down.