Hello m8,
We are having a mad week, trying to do 2 weeks work on one week.

If it is a post 1999 with drive by wire running the Bosch me7.1 ecu then it can be remapped. The remap wont give the wow factor.

The result will be around 6bhp-8nm max, sharper throttle response, and the power will be stronger higher up in the rev range. The remap can be complimented with a exhaust or sports cat to help free some more power up. IMO for £200 which incs a Pipercross filter, its worth remapping.
If he wants more power then stuff a 1.8t under the tiny bonnet..

Nick