OK, I've done my homework by searching this board, and the consensus seems to be Valentine One, mounted high to the left or right of the rearview mirror, powered by the green and white striped wire inside the sunroof/garage door opener box on the roof.
I guess I'm still a little reluctant to put a black box into my interior. Has anyone had a K40 or Passport SRX custom installed in their beast? If so, how do you like it? Does it give enough warning? Or should I just put in a V1?
Where did you have it installed? It's a little daunting. The only 3 places listed on the Passport site as being official installers in my area are Ferrari of Los Gatos, Claridges and Crown Chevrolet!