as for the AMB transponders, The TRANX160 and 260 are "compatible" but not 100%. Basically, the 160 is good up to 12" off the ground, and up to 160km/hr (about 100mph) the 260 is good up to 24" off the ground, and, you guessed it, 260km/hr (about 161mph). So for most tracks that run AMB, the 160 "should" work. And it costs about $100 less than the 260.