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GMC Sierra Performance Chips & Programmers

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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


Great product

Reviewed By Richard M (HURRICANE, UT) Reviewed for a 2006 GMC Sierra —6/12/2015 3:15 PM

thist is the 3rd Hypertech Programmer I have had and with no exception this is the best in performance fuel mileage. I bought for my 2006 GMC duramax 4X4. Has K&N filter, 4" exaust and oversized tires. The programer does everthing it said it will do - more fuel mileage, power and corrected my speedo to macth my tire size. Thanks Hypertech.

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DiabloSport inTune I-1000 Tuner Reviews


It does what I expect and more

Reviewed By Erik R (Anza, CA) Reviewed for a 2009 GMC Sierra —5/16/2015 1:43 PM

Dang. I didn't realize there was a 500 character limit. So I will keep this short and sweet. Power 5 Ease of use 5 Tuneability 4 Instructions on what does what 3 If you don't care about your 0-60 times and yada yada buy this tuner. Oh! Do NOT adjust your tune if you have smog/state inspection coming up. They don't tell you that if you adjust parameters you will fail. It took about a week for my truck to go through the "GM cycle". Great buy, autoanything rocks

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