An e30 m3 sport evo and 190e cosworth evo 2 would struggle to top that, with 2.5 litres an 16 valves or a rs500 cosworth for that matter (unless you get the wallet out, and they were all quick cars). It ain't an rs500 race car.
Take it with a pinch of salt, if you like it buy the car thats being sold, not the one in the description.