Member, Sport: Off DSC: On (>50 posts)
Join Date: Jan 2019
Location: Melbourne, Australia
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Update to my post above - I purchased from eBay (~$4) a universal 2ch 433mhz garage door remote and receiver, with a latching relay function, which I have used to replace the exhaust valve controller my exhaust came with.
This has allowed me to use one of the Homelink buttons in my rear view mirror to open/close the exhaust valve, for a stealth and somewhat OEM-like integration.