The one i'm running [chip express] great website and back up, is fantastic, better fuel economy and increased power, which is adjustable.
It's been on my fiorino 1.3 multijet for nearly 2 years with no problems.
LUIGI
no the cheap ones will be a 3p resistor in a box, you ned to pay money for things that work, good tuning box will be about the same as a good remap but with the advantage that you can re sell it when you no longer need it.