If someone really wants to get some HP wack off your catalytic converters and put in a Riss Racing Oxygen simulator in your ECU. I did it with a 328i and gained 14HP, it was dynoed before and after. You'll void your waranty but I guarantee you'll also get an increase in sound. FYI, Riss does not make an oxygen simulator for the 328i, no one does. You'll get a light you'll never be able to extinguish if you try it in that car. Conversely, if you could see the guts of a Cat you wonder how the engines run at all.
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