GÄN Tuning Büro Reviews 

I am extremely disappointed with my experience with Gan GT.

Before replacing my original order, I had already shared my exact vehicle model with them months in advance. Despite having all the necessary information, they still sent me the wrong cable.

After I reported the issue, they asked me to provide numerous photos of my car to make sure they would send the correct replacement. I cooperated and sent everything they requested. However, when they shipped the replacement, they sent it to my hometown without including my full address or contact details. I had to spend my own time repeatedly calling the delivery company just to locate and receive the package.

After waiting another month, I finally received the replacement cable—only to discover that it was wrong again.

This has been a frustrating and exhausting experience. The lack of attention to customer information, poor quality control, and unprofessional handling of my case have wasted months of my time.

At this point, I have requested a full refund. Let's see how they handle this final step, but based on my experience, I cannot recommend Gan GT to anyone.

Gan tuning for non turbo cars which my one is. So how did it go for me ? Gan say to use the car for 130km after you add the Gan tuning to your car. I have done only 60km so far. What I noticed is all the flat spots in driving your car is gone. Speed is better, even going up though the gearbox in gears. The pull of the car going up hills is also better. The other thing which I found amazing is the fuel economy is way better than before. I will add, that my sport car has a K&N air filter on it with a sport air box. I am driving my car at high speeds keeping to the speed limit at all times on the motorway as I tune in the Gan tuning chip until I get to 130km of driving.
So I still have more driving to do before I get to the 130km run in that Gan tuning recommend and hope there maybe a little more to come out of the tuning box yet. 5 Stars ☆☆☆☆☆

Problems from first day. When you tell them about problem, they alway give you some "instructions " to test device. Then they start ro reply rare. And after that they say that testing period (less than 2 months after recived device) is over and that I cant get refund.
On website they advertise 5 year warranty (LIE)

Easy to fit immediately noticeable improvement different car ( mg3)
Even the wife noticed which is unheard off
As it learns the car will be even better

product fit good tuning was fine. i feel a little bit of difference. cons every time you want to read codes from the obd2 you need to remove the tune then read the codes plug back the tuning device and drive 120km to recalibrate it

Perfect service, very good product)
Everything worked as they said))
I Recomend!!!

The delivery service it was ok, but the results for the product were bead in my case. And also do not trust them when they saying that you will have free reprogramming for the future cars, because they do not say the whole truth. You have to use the product for the same type of engine, otherwise you have to pay extra for using another reprogramming. Better to keep money in your pocket!