Chances are the some on the other side may go. GM extend the warranty on the injectors - you missed by the age of your truck:
General Motors has extended the Duramax 6600 fuel injector warranty coverage for owners of all 2001, 2002 & 2003 model-year Chevrolet and GMC Duramax 6600 equipped pickup trucks and 2003 medium-duty trucks. Issued 10/10/2006, GM Document ID#1866141 & recently #04039B indicates that additional injector warranty coverage is now available for a period of 7 years from the date the vehicle was placed into service or 200,000 miles - whichever occurs first.
The 2001 - 2004 Duramax LB7 diesels have a reported higher failure rate. Also the injectors are under the valve cover so it costs more to work on them. One of the reasons I traded my 2004 for a 2005.
Previous DAs:
2005 Chevy Silverado 3500 LT CCLB LLY SRW 4X4
2004 GMC Sierra 2500HD SE ECLB LB7 4X4
Check here for more info:
http://www.dieselplace.com/forum/index.php
OR
http://www.duramaxforum.com/forum/