The reason I am asking is because a brother of mine bought a brand new 05 DuraMax a couple of months ago. I have not driven it yet, but have ridden in it and it is a nice truck. He does not know if he will do any upgrades or not as he is worried about voiding the warranties, and at 325 hp and 575 ft lbs (that number may not be quite right) he thinks that is enough power, that is until he drove my PSD the other night. He was blown away by how much more power it had compared to his DMax. I was surpised too, since I thought it was around 230 hp stock. All I have is a Diablo Sport set on high, Dynamax 4" exhaust and a Kwik air Filter. I was not sure if the Diablo Sports claim of an increase of 100 hp and 205 lbs was right. I am running on 35" tires. I thought my modest set-up would make me about equal to the new Dmax, but I was wrong.
I am not saying all this to brag (well, maybe a little!), I am just sharing a little info about what happened. Next will be my sister and her husbands new un-modified 05 King Ranch 6.0 PSD, HEHE!!
Of course, once they mod their trucks.....
Chips2000