[bimmer456]

Does the G20 come standard with an Alarm System and does it have a tilt sensor in case the car is jacked up to try and steal the cat?

[OM3RTA]

Here in the UK, yes.

[RigaTony1982]

It does. Per the owners manual:

When the vehicle is locked, the vehicle alarm system reacts to the following changes:

Opening a door, the hood or the trunk lid.
Movements in the car's interior.
Changes in the vehicle tilt, for instance, during attempts at stealing a wheel or when towing the vehicle.
Disconnected battery voltage.
Improper use of the socket for OBD Onboard Diagnosis.
Locking the vehicle while a device is connected to the socket for the OBD Onboard-Diagnosis.

[MurrayB]

Try turning off the engine and sit in the car listening to the SiriusXM waiting for someone till it times out. Then attempt to open the door or start the engine. Surprise!

[VipinLJ]

Originally Posted by MurrayB

Try turning off the engine and sit in the car listening to the SiriusXM waiting for someone till it times out. Then attempt to open the door or start the engine. Surprise!

Or, if your wife is sitting at the back with the baby, and you get out of the driver's seat after you turn the car off and walk away, thereby causing comfort access to lock the car, and your wife tried to open the door. Surprise!