looks like you got caught with your pants down..obviously he didn't see all the other cars around you going faster as you have the high profile car. al he sees are car,car,car, celica, car,car,car. if he sees a row of those going 71mph...which car do you think he will tag and most likely win in court?
will a judge believe a celica that was speeding more than a corolla? probably. it's all about his quota and you got caught. try doing a trial by written declaration...or just appear incourt. you have a 35% change the officer will not even show up and you are off the hook. better than nothing.