If I knew some insider people I would get a yellow box and what that does is whenever a cop shoots you with his radar gun the box jams the radar saying the speed you program the box to do but I have no idea where you could get one or anything but that would be bad ass...
Rarely do these "jammers" ever actually work. I have several friends that are Highway Patrol. I assure you, these devices are worthless.
As for a radar detector, go with a Valentine-1 or an Escort 8500 X50.
But, don't come to rely solely on the detector. I'm telling you that ALOT of city and county patrols...and just about ALL State Highway Patrols are going to "instant on" radar. No matter how good your detector is, it WILL NOT alert you in time to save you from "instant on" radar. I know, I've been pulled on several occasions getting hit with instant on radar. I'm running a V-1 AND an Escort 8500 X50 in my Spyder.
The best protection is common sense. If your going to speed, do it in a "safe" area. Don't drive 65 in a 25mph residential area. Use some common sense when you speed. And, if you want to really test out your car...TAKE IT TO THE TRACK.