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Mine did the same thing before my SCT. I have the intake elbow tapped. Don't know what changed but the flutter drove me nuts...
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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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