Dont just look at the peak numbers, look at how and when in the rpm / throttle range the extra power is produced.
Speak to a tuner that can custom write your map with use of a dyno to get exactly what you want. We do this a lot for customers as often their insurer allows them to add power as a percentage of their original power.
On another note, my old Golf Plus GTTdi 140 had 13k miles on when we tuned it (188hp and 304 ft/lb) , I added a further 9k miles and was then used as a taxi, now had 100+k miles and still going strong and still using the same map.
(I bought the car with a turbo failure so turbo was brand new when I mapped it)
