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Not sure about the error, have you tried SCT tech support? They will know what it is. As for the tune change, you should be able to go from one tune to the other without changing to stock in between. I've never had a problem doing it that way, correct me if I'm wrong...
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'05 F250 6.0l Lariat Crew Shorty Dark Stone FX4
AFE, MBRP single 304 4"w/ Cat test pipe,
Overhead Auto Meters
Diesel Site coolant filter, Leveled
35x12.50x20 ATZ's on Ultra Mako's
Innovative Diesel SCT X3
Running Eric's X Street tune
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