For auction a C63 AMG W204 Saloon or Coupe German FMS Titanium cat back exhaust used but good condition i removed it  from my daughters red W204 C63 AMG, list price for this German FMS titanium exhaust  was 4K when it was new..
When the Akrapovic  and the FMS Titanium cat back exhausts systems came out they were 4K each the  remaining two Akrapovic cat back systems are 6.5K  now. 
The four FMS titanium exhaust oval tips are the same size as the OEM AMG stainless steel exhaust tips.. 
There are two videos on youtube 63 amg titanium exhaust grey 4 door c63 amg so you can hear the sound  video 1 ( c63 amg w204 tailor made exhaust ) video 2  ( C63 amg titanium exhaust) both are the same car videos by ( vandooche 63 ).
stainless steel does not come close to this sound of this FMS titanium cat back exhaust it has a deep gritty metallic German sound. 
the exhaust is collection only from chester cheshire.
i may end the auction because the exhaust is on gumtree chester cheshire as well.