The 2013 Audi TTS has 16 valves.
The 2013 Audi A4 has 16 valves.
The 2013 Audi A3 has 16 valves.
The 2013 Audi S8 has 32 valves.
The 2013 Audi S6 has 32 valves.
The 2013 Audi S5 has 24 valves.
The 2013 Audi A6 has 16 valves.
The 2013 Audi A8 has 24 valves.
The 2013 Audi S7 has 32 valves.
The 2013 Audi A7 has 24 valves.
The 2013 Audi Allroad has 16 valves.
The 2013 Audi S4 has 24 valves.