The 140PS (138bhp) 2.0 TDi PD unit goes to 201bhp with 311 lbft.
The later common rail 2.0 TDi 140 goes to 195bhp with 328lbft.
Source: Celtic Tuning.
Celtic's figures are reliable indicators of what's available from an engine.
I very much like their work, they are experienced and thorough.
Of course, there are other tuners out there, many of whom will be equally as good but I cannot comment as I have no personal experience.
There is no reason not to remap your car, all engines have significant amounts of slack tuned into them to allow for owner neglect etc etc. Just be certain to keep the service history up and the usual caveats - no thrashing cold engines and let a hot one cool down for a couple of minutes before pulling the key.
Don't bother with switchable systems - your right foot is all you need to control the torque delivery.