The 2015 Audi TTS has double overhead cam (DOHC).
The 2013 Audi TTS has double overhead cam (DOHC).
The 2012 Audi TTS has double overhead cam (DOHC).
The 2014 Audi TTS has double overhead cam (DOHC).
The 2011 Audi TTS has double overhead cam (DOHC).
The 2010 Audi TTS has double overhead cam (DOHC).
The 2009 Audi TT has double overhead cam (DOHC).
The 2009 Audi Q5 has double overhead cam (DOHC).
The 2009 Audi A6 has double overhead cam (DOHC).
The 2009 Audi S6 has double overhead cam (DOHC).
The 2009 Audi R8 has double overhead cam (DOHC).
The 2009 Audi S4 has double overhead cam (DOHC).