05 6sp with the mods listed in my signature. A few months ago I went camping at high altitude, 10,000 feet and the engine ran something awful. I have removed the Smarty Jr and the truck now smokes a lot less. I will be going up to high altitude again soon and I will be curious to see how the engine performs. My question is, has anyone had a MM3 tune for high altitude? I do not care about racing or towing, I do neither, but altitude is a big deal for me. Any suggestions or experiences out there?