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Originally Posted by RichardP1
The white wire on pin 13 is the remote antenna switch, it's ideal for an Amp as it goes on and off with the radio regardless of the ignition state.
US X5's all have amps, the European spec X5's don't have amps unless you have one of the audio upgrades like DSP.
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Correct
Euro X5's you have to option to get an amp from the factory. The plus side is you can get a 5 speed and cloth interior with a diesel haha