B2500 tuning

Greetings from Portugal!

I am the owner of a 2001 B2500. By the looks of things around here this may be an unknown model so this is basically it:

2.5 diesel engine w/ turbo intercooler
4x4
80Kw (109ps)
266Nm/2000rpm

What I need and want is more power bit I don't want to mess around with the turbo or install a powerbox. I am also looking for some adjustable shocks that are as good but less expensive than the Rancho 9000

What alternatives do I have? They can be from anywhere in the world that accepts plastic and has mail order.

Thanks