it was in good shape, 5 speed manual with cloth interior. The car looked good. I left a note on the car and asked him if he was interested in selling it. Looked to be driven by someone older, had a seat cover with like a massager thing. If he calls me back, how much are these cars worth? The paint looked really good with no rust, stock everything. Also how fast are these cars stock?? TIA. Sorry if these are noob questions.

...of the 89-91 vintage

We need more info. I don't remember seeing a 89-91 Quattro Coupe with a cloth interior - in the US. So, was it older and more square and actually a Coupe GT? which is very commonly mistaken for an UrQuattro.