Car Alarms: power lock, starter wire, scy

Question
i installled a remote start with alarm keyless entry the scy tek security astra 4000rs evrythign works perfectly but even if the alarm goes on the car still keeps working for example with someone steals the car the alarm goes on but he can get away with my car is there anyway that i can add a relay or something that i can cut the ignition? if there is explain to me in details how to do it because i wish to do this on the car thank you you've been a great help.

Answer
Cut the vehicle's starter wire and wire a relay:

Pin 30 Starter wire, keys witch side
Pin 87a Starter wire, out side
Pin 86 Ignition
Pin 85 Ground when armed out from alarm

Put a diode across pins 85 and 86 with the cathode side to pin 86.