I have an 89 n/a and am putting a stock unit back in for now. I'm having to resplice the wiring harness because a dumbass cut it(for you idiots who cut radio plugs off, they make adapters!). While I was doing this it made me wonder what that extra antenna like wire is next to the antenna wire and what all did Supras come with from the factory, like any stock woofers hidden anywhere like MKII's had, etc...
