I'm going to share my experience on the LED install, since this may help others searching the forum for answers...
As I mentioned in a previous post, adding the LED's caused my turn signals to flash super fast. Sure, you can wire in resistors, but I was looking for a more permanent and much cleaner install. I decided to replace the lighting control module... I've seen several people on here ask which one they should get, and on other forums ask where it goes... So here's all you need to know:
To fix hyper-flashing turn signals due to LED bulbs, you'll need the Novita LM487 Flasher module, found here:
https://www.amazon.com/gp/product/B001KS6GIG
https://www.amazon.com/gp/product/B001KS6GIG
Amazon is the cheapest place to find it as of this posting ($33.78)
View media item 26224
Here is the Novita module vs the GM module:
View media item 26225
View media item 26226
Make note of the side that has the 2 pins by themselves (K & E). Make sure that these are on the bottom when you insert the new module. You can easily see that this is how it goes by checking out the GM module's orientation upon removal, but just in case you didn't pay attention or forgot how it was installed, here's a reminder.
Now the fun part, swapping them out.
Pull off the top dash trim around the cluster and radio.
Remove the two screws holding in the bottom dash trim, then pull off the bottom dash trim.
Here is the Lighting Control Module:
View media item 26227
It's a little difficult to remove due to the tight space you have to work in, but if you just keep working it back and forth, eventually it'll come out. The plastic shroud makes it easy to put the replacement in, as it has little tabs to guide the module in place... Just make sure you have the 2 pins on the bottom.
Replace the dash trim in the reverse order, unless you just want to leave it off... You're an adult, do what you want.
You're done! Go for a drive and enjoy your turn signals flashing at normal speed.
(Before ordering the Novita LM487 Flasher module, make sure you have the 10 pin module on your vehicle)
I hope this helps someone.