Sure they had turbo's in the 80's the Thunderbird Turbo Coupe was one of my favorite cars. But they just didn't work as well as they do today. There were now dual scroll turbo's no direct injection. The computers in those cars were so slow they didn't respond the way they do today. Remember the size of the intercooler on a SVO Mustang? What a joke such a tiny little thing. The difference in speed of the computers and multiple o2's is dramatic for performance. I had a Buick Regal T-Type, Grand Nationals cousin. It was all stock ran 14.4. Not real fast by today's standards but back then it was some what fast.