I got my first URquattro (#187) out of Colorado Springs. Top speed 148. I now have a 2000 S4 going 160 and want to clean up the underside with a rear diffuser that will work to smooth out the bumper/trunk eddies.

Subaru Turbo WRX STI has one. Have you seen anything comparable for my car?

 

Just put one of these on the back

 

There is nothing out there for it.

 

Where do I get one or have one made?

 

Dr. where did you find this out.I ripped my plastic off about a month ago on accident. and a metal one would have saved me a lot of money.