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I'm certain you are hearing the sound of the direct injection system. My '06 GTI has direct injection and at an idle it can sometimes sound like a diesel. In fact I walked by a Jetta TDI the other day as it was idling and it was quieter than my GTI.
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2005 Honda XR650L
1989 Porsche Carrera 3.2 Coupe
2006 VW GTI/DSG
2013 Subaru BRZ WRB Limited 6MT-gone but not forgotten
2014 Nissan Murano SV
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