Celm I would take your car to another shop and have power run on another dyno.(preferbly at a shop that isnt going to get anything out of tweaking with the dyno to show more more power on the graph.)
was it 4th gear they did the run in or 3rd????
what was the air temp??
was it one of the dynos that connects to the hubs, or just a normal dyno.
must say that if i had 245hp atw, running 95 ron fuel id be very affraid of detting...just a thought...