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In Euro speced N52 engine that is initially weaker than 128i (218 HP) several tuners resolved 'underpowering' through loading cracked software from top N52 setup (stock in330i/X3). Point is in forcing ECU to accept generic software without confliting with OEM software and without getting warning codes later.
At least 3 different tuners did it AFAIK.
Result is 272 HP + mostly 5-15 HP with proper exhaust.
Cost without exhaust in Europe varies from 1200-1800 Euros for such tuning.
On USA speced car, again from other people words, seems that intake manifold should be replaced too (I have no idea what would it cost, but at least around 1000$) and than same manipulation should be done on software.
In total, I would expect that US tuner would be able to offer it for less than 3000 $ (given that US prices for tuning are much lower than in Europe).
I've no idea if anyone is doing that in US, but it is strange that such re-powering is not offered, due to its relative simplicity and general lack of adverse effects (everything remains within manufacturers specification and parts).
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