BMW always under rates their turbo hp. They did so with the release of my 2007 335i they said it was 300 hp more like 330 if you do some reading. Good point about the urea, from my research so far this urea may be used faster if fuel is supplied quicker will keep an extra bottle of it in the trunk. My service director is pretty straight with me after him seeing me go through tuned M3's and 335i turbo. Stay tuned......