Quote:
Originally Posted by Singh
You don't want an RS 6 exhaust (too quiet) you want an RS 6 Plus exhaust. It's a sports exhaust from factory and sounds much meatier and louder then a standard exhaust. Make me an offer. 
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Not strictly true. The RS6 is turbocharged, the S6 isn't. A turbocharger robs the exhaust gasses of a lot of energy, before they exit the wastegate/s. Turbochargers act as primary silencers, so the exhausts are tuned accordingly.
Fitting an RS6 exhaust to an S6 will be loud, bordering on unbearable. Ask the Audi A4 boys, who've fitted S4 / RS4 exhausts to their B5 Quattros, they'll tell you what it was like. It's a sort of loud resonance / booming, nothing like it sounds like on an S4 / RS4.
The RS6 exhaust on an S6 won't produce the sort of V8 burble it does on the car it was intended for. The same used to occur back in the '90's, with Escort RS Turbo exhausts fitted to Escort XR3i's. They were loud to the point of being seriously intrusive.