Get an alarm fitted. Mk5 GTI's are hot property, and there's been a lot of reports of cars being stolen. I think MarkN went for the Clifford option with bells & whistles, I've got the VW optional alarm on mine.
I went to Safe Sounds and they fitted a Golf Specific alarm.. It links into the remote locking system and you'd never notice it, other than a flashing LED (had them cancel all beeps). To be honest I heard the car cannot be started without the key, so had them fit a standard alarm.
God help them breaking into my place looking for keys! Because the Cops won't...
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