The rs 500 was a sierra ...
and a mk1 sierra with the whale tail, the rs500s are big bucks nowadays
If i remember right they was only made in White,Black and Moonstone Blue........the one i went in was the first car i was ever genuinely frightened in i was like a little old woman hiding down in the footwell ......seen a few mk1 and 2 Escorts with the Cosworth lump that could certainly shift !
theres a few on youtube packing 600hp under the bonnet, doughnut machine