They do it without bypassing anything. I've had my AG4 since about '02 and they do not bypass the clutch. It is impossible to leave the car in gear and start it. The reason being is that you need to 1: Have the car running 2: leave the car in neutral 3: 3-4 button key sequence on the remote 4: turn off the car (car remains running) 5: shut the door 6: arm the alarm
at which point the car will either turn off or stay on for XX seconds if you have the built in turbo timer feature enabled.