I don't understand.. why did you need a new ECU? I did this conversion on an '06 325i (to become same specs as 330i) and I just flashed the current ECU using a GT1 + upgraded to the three stage manifold.
Does the 3.0i and 3.0si have the same exhaust as well? On the 3 series the 325i is more restrictive.
Enjoy the extra HP... makes a big difference with a negligable change in fuel economy. Same reason I'd never get a 3.0si and stick with a 3.0i given the choice. This simple cheap mod is all you need, and get to enjoy cheaper car insurance.
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