I would probably solder the connections. While they can leave the wires nearly unmolested upon removal, those quick connect things are notoriously unreliable.

It is a pretty neat system though. And yes its two-way, so incase of break in it will alert. There are a couple different packages. One is remote start only, the other is remote start with alarm.

I just am not looking forward to installing such system. Probably a half day project!

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1991 560 SEL / 185k miles
1992 750il / 17k miles - project car