Diesel tuning box long term?

[exiged]

I know they've come on in recent years and are now controlling fueling and boost.im not looking to start a box vs map debate as this is purely down to warranty reasons only that id be going for a box,which would be from tdi or dtuk rather than a cheapie from ebay.

Any comments from long term users of newer gen tuning boxes??.

The cars a 330d which uses the same engine and gearbox as the 335d so i cant see how the extra torque could be a problem.All id be concerned about is fuel pump,injectors etc with over fueling.

[Ares]

I've just had my 640d 'done'. Power upped to 370bhp - fully warranted and approved by BMW (AC Schnitzer product)

A lot more expensive than the outfits you mention, but gives assurance.

That said, if BMW and Schnitzer are happy to warranty transmission on such a power increase (and the same 8sp ZF box is used by even more powerful BMWs), there can't be much of an issue!

[exiged]

i forgot to mention price was the other factor

[dumfriesdave]

I used a tuning box on my Mondeos-a car known for injector issues.
Covered around 150k in 3 years.
Never had any problems, and would use one again.