Only the full exhaust with downpipe, race cats etc, but that is a lot of money for a mild improvement. Don't know if an uprated ful pump in yours would make a difference or not, would need a 'custom' map of sorts to see max benefits.
I should imagine the principle is the same, but searching web and reading magazines there does seem to be a proliferation of Diesel tuners (incuding inline/plug in tuning devices). My advice would be to try and catch Devonmikeyboy as he is wise in the ways of diesel tuning.
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