Reviewed By ryan w (Cassville, MO) Reviewed for a 2005 GMC Sierra —7/18/2017 4:54 PM
Easy to install easy to use does everything that i need it to do
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Reviewed By Howard M (ENTERPRISE, AL) Reviewed for a 2005 GMC Sierra —12/13/2013 6:07 AM
I purchased the Bully Dog to increase fuel economy on my 6.6 GMC diesel. At first it didn't seem to make any difference so I called their tech support (they were great!) and discovered I did not have the settings correct. Since then I have seen an improvement on mileage and I love the different feel in the over all performance. I am glad I made the purchase!