If it's on the driver's side, it could be the N80 evap purge valve resonanting in the carbon can. Mine has made a quiet ticking noise for years, which comes and goes depending on throttle position at town speeds. That is the only thing I can think of as it sounds very 'solednoidy'. I only normally notice it around town because the noise bounces off walls etc.
Does it make the noise when the engine is cold, or just when it's hot?If the latter, it's probably something mechanical. Hydraulic lifter lash, VVT noise, Chain noise etc. Something of that nature.It's definitely not the turbo.