Just my semi-educated opinion (and that of the Bosch Engineers) as mentioned in other threads... In laymans terms, you can dump more gas or more air, or both into this engine and it will not produce noticable HP gains because the Bosch ECU / PCM and sensors are programmed to maintain stociometric AFR... So, the timing will be retarded, fuel will be trimmed to keep it there...

Until you manipulate (tune) the ECU to override the OEM programming, you'll be pissing in the wind...

I'm surprised you guys haven't been searching the earlier threads regarding this issue...

That's why I bust ***** when people start talking about intakes, exhaust, etc. to make more HP in this car, without thinking about the Engine Management Systems that control it...