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My June 1985 production car (sold as a 1985 MY) has an OEM subwoofer, wiring, and mounting points for it. Perhaps it was not available on early 1985 MY cars, but after a certain production date? Please add info if you have it.
we have an 86 model that has that subwoofer
In the UK, all Mk1a (without rear speakers) had the under seat subwoofer, all Mk1b (with rear speakers) did not have the subwoofer.