Looking for people that have 600 plus hp at high ele out of their 6.0. I live at 5k ele and am looking to build a motor that is street able without huge smoke unless getting into the bigger side of its hp. I have had other trucks that made big power but were to Smokey for my desire now at over 50 years old. I just bought an 05 that has 55k miles and is perfect, to build a street truck but not my daily driver. I have an 05 X that has 500 RWHP and would like to take this new truck to the next level but still be able to drive it without smoking everyone out when trying to take off from a stoplight in the summer heat. I need people with experience at ele as it makes a huge difference in building this kind of project. Thanks to all responses and references.