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The 2006 Audi TT has 20 valves.
The 2003 Audi TT has 20 valves.
The 2002 Audi TT has 20 valves.
The 2001 Audi TT has 20 valves.
The 2004 Audi TT has 20 valves.
The 2008 Audi TT has 16 valves.
The 2005 Audi TT has 20 valves.
The 2015 Audi TTS has 16 valves.
The 2014 Audi TT has 16 valves.
The 2013 Audi TT-RS has 20 valves.
The 2012 Audi TT-RS has 20 valves.
Audi TT was created in 1998.