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I'm just supposing here, but I doubt that the 325i engine is "detuned" as you say. The critical path to making horsepower in a naturally aspirated engne is how much air you can get into the combustion chamber, and how efficiently can you get it out.
The difference between the 325i engine and the 330i engine is a more elaborate and efficient 3-stage intake system on the 330i engine, allowing the engine to develop more torque and HP and a free flowing exhaust system. The combustion chamber (cylinder head, piston crown, bore/stroke) are identical between the 325i and 330i. So how do you improve on this with a chip? It's possible that a chip can marginally add some torque and HP, but the engine components will need to be changed to substantially change the torque/HP characteristics of the engine.
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