Cobra advertizes some of their radar detectors as undetectable to Spectre, but that is a flat out lie. We tested one of their supposedly undetectable models at the last GoL and it was, by far, the easist to detect.
Radar Detector Tests and Reviews by Guys of LIDAR - LASER
Unfortunately for you, you only have four choices of detectors that are truly undetectable and none of them are cheap. They are the Bel STi Magnum, the Escort RedLine and two permanently installed detectors, the Bel STi-R Plus and the Escort 9500ci. Since you mentioned that you will be moving your detector between cars a lot, I'd personally recommend the Bel STi Magnum over the RedLine because it has better audio rampup, meaning that the audio alert better matches the actual alert strength. The best way to hide your radar detector is to hardwire it high. It's pretty easy to do, but it'll take some time for four cars.
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