ISX same as X- series?

[marek4792]

X-15 has a single module aftertreatment resembles an cm871 dpf almost, a few less sensors at the egr circuit. Supposedly the Productivity series is the bridge between the efficiency and performance series. Fuel pump is isolated so they say redesigned with individual heads instead of one unit. I'm about 210,000 miles on mine with almost no issues. Like every truck you either get a good one or you get garbage that bankrupts you.