these are the reasons i did not get the 6.7l. just about everyone i know has had problems with them. its still a cummins so the bugs will be worked out but the 5.9l is a tried and true bada$$
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07 5.9L, 4x4, AFE Stage 2, Straight 4in w/6in tip, Smarty and lovin it, Silencer ring mia, 3.73 gears, 315/70R17 BFG's, 2" leveling kit, Dual Trumpet 18whlr air horn, Isspro gauges, and more to come