Disabling the keyless entry system should make a big difference. But, if you want our honest opinion, the Focus ST is one of the cars that thieves target. If we had one, we'd probably also get something like the Autowatch Ghost Immobiliser or another immobiliser system to make it harder to steal. This obviously depends on where you live, if you park on the street etc. You could also go for a tracker from Tracker or the Nano Tracker that we reviewed from Rewire Security (it just won our Car Security Award, too): kit.honestjohn.co.uk/reviews/review-spytrack-nano-.../