I know quite a few C5 S6 owners that upgrade to the RS 6 exhaust and are really happy with it. Have a look through the C5 S6 section at RS246, Grizz at Unit 20 has fitted a few to S6s and said they sound awesome too.
This guy reckons it was better then his old Milltek. I only want £250 for my cat back. Thats a fraction of the price of a Milltek, for a better sound, apparently.
http://audisrs.com/sutra296712.php&highlight=#296712
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2009 Audi RS 6 Saloon V10 - 420mm Ceramics, Keyless, Soft Close, Adaptive Cruise, Glass Sunroof, Blinds, Twin Pane & UV, Freeview & DAB, High Beam Assist, MTM bits, Audi Exclusive Bits, MRC, Milltek, GYEF1 ASY2's, Bluetooth streaming music to AMI mod - 753 PS/1021 NM
2016 Audi S3 Saloon, Sepang, S-Tronic - B&O, Tech Pack etc... Company Car
1995 Audi A8 4.2 V8 quattro Sport - Bose, Solar, Blinds
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