On Audi V-6's it should be on the block front flat surface in front of the right cylinder head. The Rt. or Lt. hand of a car is while sitting in it.
the standard one haves a V8 wheres the r8 V10 haves a V10 engine
on the engine
loction engine number
The R8 haves an V8 engine wheres the R8-V10 haves a V10 engine which is more powerful, the r8-v10 also haves minor changes on the design :)
in front of the engine check this file https://sites.google.com/site/autobestanswer/audi
The 2012 Audi TTS has an inline 4 engine.
The 2010 Audi TTS has an inline 4 engine.
The 2014 Audi TTS has an inline 4 engine.
The 2015 Audi TT has an inline 4 engine.
The 2011 Audi TT has an inline 4 engine.
The 2009 Audi TTS has an inline 4 engine.
The 2013 Audi TT has an inline 4 engine.