Radio control Porsche Carrera? or ferrari enzo... I forgot what was faster......
But seriously, traxxas sells cars that run around 60-70 mph stock.
It is seriously un believeable until you see them in person.
http://traxxas.com/products/promo/j33-n4t33-promo.htm
take 2 4-tecs motors and put them in the same car and gear them up 2x or even 1.5 (to compensate for the additional weight. and you will have one hella fast car.