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*sorry for reviving dead thread, wondering if you found a solution?
I've experienced data loss issues using a y-splitter on the OBD port, sometimes I would just freeze up data on one of my two devices randomly. It never happened when it was the only device connected. I have not tried to leave this devices installed with the car off so I can't comment on the battery draining.
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2016 LTG Camaro in Hyper Blue with MRT V3 Catback and Brembo SS Brakes. 
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