ciao.
Di scarichi per l'S5 ce ne sono tanti.
Akrapovic,Millteck.Capristo o Superprint.

http://www.akrapovic.com/car-exhaust.../s5-2007-2009/

http://www.millteksport.com/exhaust....?variantid=262

http://www.capristo.de/de/exhaustsys...s4-abgasanlage

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http://www.youtube.com/results?searc...pristo+S5&aq=f

http://www.youtube.com/watch?v=XIEOt5PjbfA

http://www.youtube.com/watch?v=2gM4VsnZ52M