well a friend of ours has a 05 Duramax and I'm not impressed at all to be honest. I've driven it quite a bit and towed with it even. I still think my Superduty pulls better and has a better pull than his Duramax. I'm not trying to bash on GM product because my family has always owned GM vehicles but I just think that if you want a real truck buy a Ford or Dodge. And besides IFS is for cars not trucks. Give me a good ol D60.