I did not know about the shutter but I did think that what was what happened when I hit the High Beams. As far as the auto-leveling, I mentioned that because someone said about a BMW feature and I don't think my car has that since it has the manual leveling screws which effect both High and Low beams. The LED's bulbs I used were not in the rear which my car already has but in the front. I guess I did not explain that to well. I installed Switchback LED bulbs and they have to use the resistors or you get that Hyper Blinking. I left the resistor unhooked on one side and tried it out and it did do that Hyper Blinking thing and my sequential tail lights actually quit working sequentially and just would blink all bulbs together.. I don't know about the cruise control as I have never heard that mentions on the GT500 forums but I will look into it.
Here is a link to the Switchback LED blinker bulbs.
Thanks for the info