While the i4Siri team is hard at work on a LEGAL way to get Siri on 5.1.1 devices, we have found that a majority of our users have come across a GUI by illegitimate means. Regardless of the method of obtaining a GUI we want to still support our users, therefore we have provided a package for these users on our official cydia repo. We by no means support these illegitimate methods due to the violation of copyright to both Apple and several jailbreak developers like chpwn. Please be aware of malicious or even illegal software.
Our Cydia Repository: http://i4siri.com/repo
Package: i4Siri Non-Spire