Aero mods for new beetle
 

I was looking around to see if I could find if any one has tried to quantify the improvement putting an air dam on a new beetle has given.
I could not find any. Did I miss something?
I am thinking I will put a lawn edging or conveyer belt air dam under there while I have it up in the air replacing oxygen sensors and fixing oil leak.

air dam
 

It looks like VW has covered the air dam issue fairly well from the factory.There's very little access for underbody airflow which might strike chassis components.
http://i1271.photobucket.com/albums/...ntitled8-1.jpg