I'm no expert but by the looks of my underbody guard on myA6, they put some thought into it. Aerodynamics to reduce drag, air scoops for directiing flow to specific locations and overall protection from road debri getting up and into the 'jewels'.
I don't think they would of put the time and weight into the car unless they felt it served a purpose.
Unless I got a real good explanantion from an Audi Engineer - mine stays in.
CA2.7TS
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