Indeed that was a mercur in the USA. This was only for europe a sierra cosworth. 16valve 2.0l turbo engine with stock 200 hp.( in 1986 !! ) Could very easily be tuned up to 400hp !! This one had +- 320 hp. It had the good old turbo gap and blow off valve. Look on youtube for Sierra cosworth. Mine was sold to the USA and was the fist and only sierra cosworth in the states.
I had a mercur US model all doped up I assume you delt with Brands Hatch Performance in the UK? They rock