Most Popular No - Not California Approved for 2018 GMC Sierra 2500

Works pretty good. I get a mile to the gallon better. When I tow a 13000 lbs fifth wheel camper it really does a great job. More hp and 1.6 mile to gallon better. Now the truck doesn’t shift gears as much.

Not a huge difference, towing my 28' travel trailer, but I do appreciate the firmer shifts and ability to see more engine parameters on screen. Over all, happy with the product. Easy to install and use.

The Superchips Flashpaq F5 did exactly what it said it would, Better fuel mileage more power at gas pedal i think its great for the 2500 Gmc 6.0

I love this product. I can change my truck to have to pull the house down or set it up to Canon Ball Run lol

Just got programmer installed with dash pod, I haven't driven for any amount of time with the programmer running, but the programmer was easy to set up. It has a ton of functions to customize programming, I'm looking forward to using for towing 33 ft fifth wheel. The installation was fairly easy on an 03 GMC Sierra.

It works as promised... our water supply never froze during subfreezing temperatures

So far I have only used it on the 87 octane tune setting. Definitely an overall mild improvement in performance. Does not kick out of overdrive while in cruise control mode nearly as often. Picked up at least one possibly two miles per gallon.

Easy plug and play 87 octane tune gives better throttle response and shifts reprogrammed the speed limiter a bigger speed on a Chevy Avalanche and it worked perfectly plug and play install took 10 minutes which was mostly running the cable to the OBD port

I love it and the customer service is the best I’ve ever seen

Product performs as expected. What's important to me is the company I purchase from.. The follow up from the etrailer team is excellent!!!

I had to update the tuner two times in order to get the tunes for my truck once I got the tune installed it don’t change my shift points in the transmission my first chip I got back in 2000 changed my shift points as well up the horse power .you would think we’d have better technology in 2021. I had called the tech line about four times and all the techs I talked to were nice and helpful.