there is one thing u can do. a guys did it in the rs liberty club that i was in before SAU...
When he put his alarm in he installed about 6 sirens all around the car. 2 in the bonnet, 3 inside the car and one in the boot of the car. The ones inside the car were placed 2 under the dash (drivers side) and one under the passangers seat.
this was about a $40k subi so the security had to be good. He left it at a train station one day and caught the train to work, or somewhere. When he got back his window was smashed and the door was unlocked. and one of the shop keepers told him that his alarm had been going off all day. Obvisally he went to the cops and told them what happened they said there wasnt much why could do.
2 days later he got a call from the police saying that there was a guys in hospital that they think broke into his car.
The guy who broke into his car went to hospital 2 days after breaking into his car. Because of the 2 sirens place under the dash on the drivers side, when he was trynig to hot-wire the car both his eardrums burst. If anyone has had their eardrums burst they will know how it feels, it ***n hurts...
So install more sirens. If u cant stop the ***ers deffen them.
P.S. sorry for all the spelling mistakes.