It's set in the DME. Carly isn't capable of editing the DME.
Depending on the year of your car you can use an OpenFlash tablet to code the DME and change the limiter. I think your car is an MSV80, which means it will work.
http://procedetuning.com/328i/OFT/index.html
There was a guy on here who edited his own MSV70 car, I don't think his method worked on the MSV80 but it was a while since I read the thread:
http://www.e90post.com/forums/showthread.php?t=1035058
Your best bet would be to find a local tuner and ask for the speed limit to be removed, that will be cheaper than the OpenFlash tablet. The problem is that this could be overwritten at the dealer if you ever go for a software update.