I seem to see a trend that the 2005 and later KJs get better mileage than the 02-04 KJs. I did a little looking around on the net and noticed that the injectors for the two series are different part numbers. RockAuto.com has pictures of the two and there is a real difference in them. I am wondering if switching the earlier model injectors for the later would be of any benefit? Can it even be done? Here are the pictures of the two:
2005 Injector
2003 Injector
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