I would definately reccommend super unleaded for ANY turbocharged car. The added octain prevents the fuel from ignigjting before it's supposed to under the increased pressure that the turbo can produce.
The 2010 Audi A4 runs on premium unleaded (recommended).
The 2004 Audi A4 runs on premium unleaded (required).
The 2012 Audi A4 runs on premium unleaded (required).
The 2005 Audi A4 runs on premium unleaded (required).
The 2002 Audi A4 runs on premium unleaded (required).
The 2014 Audi A4 runs on premium unleaded (required).
The 2013 Audi A4 runs on premium unleaded (required).
The 2006 Audi A4 runs on premium unleaded (required).
The 2003 Audi A4 runs on premium unleaded (required).
The 2007 Audi A4 runs on premium unleaded (required).
The 2001 Audi A4 runs on premium unleaded (required).
The 2011 Audi A4 runs on premium unleaded (required).