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For a given power level you need the appropriate amount of air, and fuel.
The turbocharger is the same, which is a good start. The exhaust is the same and the intercooler is the same. So in air terms theres no issue. The engine can happily flow the same amounts of air as a 330d.
On the fuel side, the 325d does have smaller injectors than the 330. How much smaller those are, and how much of a hinderance that is, i dont know.
What you need is someone who knows these cars properly and will write you a custom map, rather than going to "superchip" or whatever and getting a generic stage 1 tune, that way they will be able to maximise what you have, rather than just playing it safe and going for a % over stock as they usually do. I suspect if you want to match the ~300hp a 330d can achieve with dpf-delete etc then you'll definately need 330d injectors to match.
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