Advantages: Very fast post, very easy to install. Like everyone trying out a product like this I was a bit unsure what to expect, as there is a lot of debate online on the effectiveness of the application, or is ecu tuning better. Regards ECU tuning I don't know what the answer is, but regards the GAN unit, I can't say I was very pleasantly surprised by the difference almost immediately. Just to be clear this won't make a slow N/A car fast, but it will make a slow car faster, which is all I was really looking for. There is a definite change in torque, where I used to have to work the revs to 3/3500 when I needed to over take, or get moving quickly on to a roundabout, now from 2500rpm there is more pull and response. Mazda MZR 1.6 petrols aren't quick, they are underpowered for their size, and as I said, this has not made it a fast car, but it does now feel a lot livelier, responsive and safer in traffic as a result. I have had no engine warning lights, or unusual engine idling now 6 weeks after installing either, so all good there
Disadvantages: Minor suggestion would be to supply with a velcro tape fixing to secure the unit out of the way.
Comment: Great communication and help from the company when I was trying to find the right product, as the engine crossed model years.
