VOlkswagen and Porsche have very close relations, closer than others, because they're family. They spawned from teh same prototypes, and have kept contact ever since. The latest family project is the Touareg/Cayenne which was developed by VW's and Porsches engineers in companionship. VW also builds the bodywork for the Cayenne.

You also mention Ferdinand Piech, he's also family. Ferdninand Porsche's sister married into the Piech family. Ferry Porsche (Ferdinand Porsche's son, and the founder of the Porsche sportscars) was Ferdinand Piech's uncle.

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If you have a 5 cylinder, you don't need a stereo.

1999 Audi A6 quattro
1990 Volkswagen Golf CL Syncro
1987 Audi Coupe quattro