I have found that the FM transmitters give a very poor quality of sound. Even the Griffin Itrip is not that great. I got the £8 cable from Ford and the chap just ran the cable through to the storage area below the centre console. I just tucked the connector away and plug my ipod in whenever I need it. No hassles, no drilling and perfect sound directly to the AUX socket.
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Escort 1.6GLE, Escort 1.3, Fiesta 1.3, Fiesta ST!