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Breathe New Life Into Your 6.4L Powerstroke or MaxxForce 7: Why the Grizzly GA36920 Injector Is a Smart Upgrade If you're running a 2007–2010 Ford 6.4L Powerstroke or Navistar MaxxForce 7, you know how critical fuel injection performance is to power, efficiency, and emissions. Over time, injectors wear down—leading to poor fuel economy, rough idling, and even engine damage. That’s where the Grizzly GA36920 Remanufactured Piezo Injector comes in. What Is …