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2008 GMC Sierra Power Programmers & Performance Tuners

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Latest Customer Reviews

Range Active Fuel Management Disable Device Reviews


Works as Advertised

Reviewed By peter v (Middletown, RI) Reviewed for a 2008 GMC Sierra —6/22/2015 3:24 AM

The AFM Disable is a great device. I've had it installed for roughly 1 month and it does exactly as is claims to, and no more. My base idle seems to be getting smoother and I don't miss the sometimes jerky transitions between 4 and 8 cylinders (especially noticeable if it occurs during a trans downshift. I'm not noticing a real impact in actual fuel mileage. I'd rather have a smoother running, longer lasting engine regardless.

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Hypertech Max Energy Programmer Reviews


2011 Colorado

Reviewed By Richard E (LONG BEACH, MS) Reviewed for a 2008 GMC Sierra —3/28/2015 2:32 AM

The programmer works great and has plenty of options and is easy to use. This programmer doesn't have preset programs like others I've had but the Hypertech has more fine tune ability.into haven't had a chance to play with it very much. I have it set fairly mild and I can definitely tell a difference.

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Bully Dog Triple Dog GT Tuner (49-State Legal) Reviews


great product

Reviewed By zachary z (TRAVERSE CITY, MI) Reviewed for a 2008 GMC Sierra —8/19/2014 3:57 AM

Can really tell a difference. Only down side is that the screen is a lot smaller than what I thought so it's somewhat hard to read going down the road.

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