There's a few things that a remap of the standard ECU will do:
You'll get a few more BHP, but don't expect miracles! It reduces the traction control so that you can accelerate smoother in 1st and don't get as bogged down. It changes the upper rev limiter from 6750 rpm to 7250 rpm.
The only issue you might have is that you're essentially fooling the engine into thinking it's an FRP. These have essentially the same engine as earlier pumas, whereas 2001 on onwards, the Puma has two hego sensors to comply with the change in emissions regulations. There is a shortcut to bypass the difference, so not TOO much of a problem.
Dal's got his remapped, and there is a noticeable difference in performance. It's not necessarily a great deal faster, but it does put down the power better.