I had an 09 CTS rental for all last week, not a bad car for a base vehicle! Anyways I really enjoy the turn signal that allows you to tap the stalk either up or down and will automaticly flash the turn signal 3 times and stop. I did some searching around and it looks like all cadillacs are coming equipt with this feature. My question is has anyone looked into adding this to their vehicle? Has anyone already added this? Is it just a basic flasher up grade?