[BigRedChevy]

You best mod would be to put a turbo back exhaust on it. Most people that does it has to get a Quadzilla tuner, PPE Race tuner or EFI live to block the codes. Since you already have efi live then you will only need the exhaust. If you need help getting started with how to tune the Durmax contact IdahoRob (http://www.duramaxforum.com/forum/members/60.html). He is a sponsor on this site and a EFI Live vendor. He can help you write some awesome tunes for you truck that will give you a little more towing power and some great MPG gains. I would also look at doing a set of guages to watch your boost levels and EGTs.