I suggest that anyone doubting, or has preconceptions on how the tuning boxes supplied by dtuk operate, that they talk to Andrew first @ABYSS before making a judgement based upon "they're all the same". As I stated he is a site sponsor and will be happy to discuss their tuning boxes his company supplies interacts with the engine and the lasting effect it will have. Those who have spoken to him, with an open mind and without preconceptions, would be then reassured. I had the same misgivings, largely based upon inaccuracies perpetrated on different forums. Having owned different cars, with remaps and with tuning boxes I can state that if you go with a professional supplier who thoroughly tests their products then there shouldn't be any issues. However, as the op has discovered even remaps can produce the wrong results. There are plenty of generic remaps that can be obtained that then are used by, so called, professional remappers.Im not real up on the tech of these tuning boxes but the basic principle remains the same and that is to vary the voltage to the sensor. If you have more fuel going in than air you will clog the dpf. The cheap boxes use to use a fixed resistor and now they have become variable.
This was the car I was refering to:
There is no doubt, if you wish to spend the money, then a custom remap matched to the characteristics of your engine and tested on a dyno is a superior product. But the decision is up to the owner.
We have this debate everytime I mention tuning boxes, yes they are not all the same, yes, just like some who advertise remaps, there are duff ones out there. DTUK are not one of them as many, many, owners will testify here in this forum..