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I have a friend that has an 07 with the 5.9 and he said he has a blueish grey smoke that comes out of his exhaust. he said it it is not the black smoke we all like to see. He said it still runs fine but has never seen a truck smoke that color before. All he has done to it is an AFE stage II and he cut the cat off. He only has about 13,000 miles on it. Could this be bad fuel or is it something else. Thanks for any help. :thumbsup