The Audi S8 was released in the UK in 1996. It was not released into the US market until 1999, and this new model was aesthetically different from the UK model.
s8
The 2007 Audi S8 has 40 valves.
The 2008 Audi S8 has 40 valves.
The 2013 Audi S8 has 32 valves.
The 2013 Audi S8 has a V8 engine.
The 2001 Audi S8 has 40 valves.
The 2001 Audi S8 has a V8 engine.
The 2003 Audi S8 has a V8 engine.
The 2014 Audi S8 has 32 valves.
The 2009 Audi S8 has a V10 engine.
The 2002 Audi S8 has a V8 engine.
The 2007 Audi S8 has a V10 engine.