As I read your information, removing the downpipe is the first step of gettings some real power out of this engine.
What you wrote about the missing effect of adding a bigger IC for these cars, I can someway agree.
I had some dynos before fitting the bigger IC at aprox 260hp/606nm and after fitting the IC and a remap, it dynoed 267hp/615nm. Barely any change.
But the drive after fitting the bigger IC has changed. The accelleration from 80km/h and upwards is amazing. A quite different pull when flooring it. And that is with only 7% more fuel added compared to OEM.
I hope to get the pipe fitted and remaped this week, but unfortunately we got at lot of snow here in denmark these days. So testing will not be in ideal conditions :-(
And by the way, thnx for sharing the information :-)
'06 E91 330dA Sparkling Graphite|19" AvantGarde M359 Satin Black|335i brakes|Bilstein B16 IRC|Powerflex|GroundControl|Wagner|Ecotune|Turbo Dynamics|Zimmermann