What does a throttling pack do?
The idea behind it is that it removes the down throttle that vzw puts on your mobile network connections (3g) so that when you reach a certain data limit (even if you have unlimited data), it will throttle back your network speeds to keep you from sucking up bandwidth. At least that is my interpretation of it.
What the mod does is delete about 6-7 throttle files from your classes.dex file located in /system/framework/service.jar....and recompiles the classes.dex with deleted throttle files into a new service.jar file....which you replace the one in your /system/framework...and reboot. So far this causes a FC in settings>wireless and networks>mobile networks. This is not a big deal as there isnt much a need to go into that setting anyway.
You can apply it...it is a reversible mod. If you do it...and dont like it...you can download the original rom you are using open with 7zip or winrar...extract the service.jar from it...and move to your phone in /system/framework and replace the modded one.