Well, I also only today installed my (software upgraded for N55, but otherwise old model) Ultimate box in my M235i - and went for a short ride afterwards. I must admit my very first impressions after I first installed it in my N20 F10 528xi, and my feeling of new life (especially in low rpm) was definitely more positive..
I only hope I installed it properly - the harness has no description/markings whatsoever, so I just assumed either way of the two possible is OK and plugged one bypass into the MAP, and the other - into the TMAP sensor (just those shown in the pics here):
http://www.2addicts.com/forums/showp...75&postcount=4
Well, perhaps it needs some time to feel stronger?
Piotr