2.0is (could be confused with the e85 2.0)? You mean the e89 20i? From what I've seen there's the AC one as mentioned here, plus some box you can plug in (it was mentioned on the e89 US forums/bimmerpost). I've not seen anything else though as yet.
YEA you can get the kelleners (sp?) or racechip - http://www.racechip.de/en/chiptuning/bmw/z4/e89/sdrive20i-135kw/index.php or speedbuster = http://www.speed-buster.de/en/chiptuning-box-bmw-z4-sdrive20i-135-kw-184-ps/a-10109573/
Only looked at first link but they can tune the 28i to higher output than 20i. Noticed same on acs site. There has to be differences between the cats for that to be possible......
