Remap it, don't get a chip/tuning box. All they're doing is giving it more fuel or winding up the boost. A proper remap will change all the points on the map (can't remember the technical term), and will still be using all the sensor readings whereas the chip would just be "OMG GIVE IT MORE FUEL".
Chrysler 3.0 CRD V6 is 218 HP & 510 NM stock, and one mapper claims (for example) to get 258 HP and 600 NM.
Also, it's a lot better to get a proper remap (check it for errors, stick it on the rollers stock, give it a generic 3.0 CRD V6 map on it, stick it on the rollers again, and then customize the map to your engine) done rather than simply a guy coming to you with his laptop and sticking on a generic 3.0 CRD V6 map.
at least someone knows waht they are on about