I test drove a 2001 2500 crew 4x4 D/A intercooler with 120k miles. I know nothing about them other than what I've little I've read here, tow rig, and a duramax site. Cool truck. I’m hooked on getting a diesel now. Just want to know what to look for. I’ll try to drive a few trucks to compare the “feel”. This one had kind of a mushy power band, no turbo noise (that I could hear) and no surge from when the turbo spooled up. Never felt like it pulled real strong, but I don’t know what to expect from the diesel. Ok now for the dumb questions about the Duramax: Are they all turbos? Is an intercooler stock? Is there any turbo noise? Is there any noticeable surge when the turbo kicks in? Is there any noticeable power band or is it that they produce such steady high torque there is no “sweet spot” where it pulls best? Are there any problems other than the cracked injectors and cracked fuel filters? Any years to stay away from? Thanks for any input.