diesel tuning boxes ( again )

[Executer]

Hi all,

I know it has been asked before but I am interested in buying a diesel tuning box for my focus but I have the impression that it may not be safe to use.

There other cheap boxes out there for all cars but all they have is a resistor and just sends a false reading to the ecu.

I am thinking that perhaps these diesel boxes are not much different?

I was reading on another forum yesterday ( cant remeber which one ) that all it does is lie to the ecu and up the fuel pressure and someone even posted that their fuel rail broke due to the increased load.

What are your thoughts?

I'd like a dyno tune but I'd have to wait till warranty is up.
Can you get a Haltec piggyback ecu to work with a tdci focus?