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Message: [QUOTE="Tsgs69400, post: 1524003, member: 10410"] Guys, i have not changed the power level. Simply updated to the latest software which enabled the use of the exhaust brake. I have run the 450hp tunes since i ******d this in November of 16’. Last March i was easily getting 18-19mpg freeway around 40 degree temps. That was on the same tune. Just without exhaust brake function ability. Im gonna put the factory air box in and see if anything changes. Only other thought i had was that some oil from the s&b may have gotten on the maf. Ill check that out too. [/QUOTE]

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