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      10-09-2019, 09:02 PM   #3
Jsinghzzzz
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Drives: Black Z4M Coupe
Join Date: Oct 2017
Location: Bay Area, CA

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You could also install one of those OBD tracking devices, which alert you how/when the car is driven or just take the set of keys with you. Less of a mess than rigging up a kill switch.

I would also just talk to your BIL that you're protective of the car and don't like anyone else to drive it. It's annoying and a bit awkward, but I had a similar issue with my cousins.
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