The MPG takes a while to go up (And not much) because these things are tight and why they're so quiet. By the time you hit 100,000 miles they sound just like all the other diesels.

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2007.5 Dodge Ram 3500 HD,QC, 6.7L Cummins, 6speed Auto, 4X4, Bighorn Edition.
Click for installs: Carr Steps PML Diff Cover Edge Juice with Attitude Volant Intake Hankook ATM RF10