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6.0 is a huge flop of a motor period. No mater what you do one of the cylenders will always run to lean because of a design flaw and the reason international lost the contract with ford currently in litigation. The 6.4 runs very strong and they just released a dpf delete tune that made 500 and 1100 at the wheels on the stock filter and exhaust. Say what you want but no duramax or cummins will run low 13's with just a tune or 1200.00 dollars. One truck has a little more aggressive tune that runs high 12's loaded crewcab by the way.
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