Torrent includes two files snapchat version 3.1.0.2 and snapsync. both work together.

1) uninstall snapchat
2) install snapchat form this torrent
3) install snapsync
4) open snapsync and choose a directory on your sdcard
5) open google play and unselect auto update add for snapchat
6) send blessings to flamerFTW

now every time you get a snapchat they are automatically saved to your sdcard. no logging out, use the default snap chat app for everything. It all works behind the scenes.

do not try and update snapchat though, never versions don't work with snapsync. like it or leave it.