Reviewed By Tommy T (Mountainair, NM) Reviewed for a 2005 GMC Sierra —5/25/2014 8:57 AM
Used this product on my 05 gmc and it woke my duramax up works good on all settings.
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!
Reviewed By Samuel F (Calabasas, CA) Reviewed for a 2005 GMC Sierra —10/31/2013 2:33 PM
I've used many different programmers on different vehicles and I must say this one has the most noticeable gains in torque, throttle response and gas mileage that I have seen. Highly Recommend for all Chevy applications.