I installed a "River City Diesel" EGR delete kit in my '05. I'll tell you, it took a load off my mind as it can lead to head gasket failure too ($$$). On my '05, it didn't throw any codes but, it supposedly throws a code on the '06-'07's. You could check their website out for info. If you have to, the Bulletproof one looks real good from Neal Technologies (bulletproofdiesel.com). There is an awesome article in the Sept 2010 "Diesel Power" magazine on page 122. This magazine is a must for any diesel owner who tinkers on their truck. Good luck.