Believe it or not, in terms of produced road legal cars, the XJ220 hold the title. What about the McLaren F1 LM? well... only 5 were produced. As oppose to 250-280 produced by Jaguar. New regulations setting a higher limit, technically knocks the McLaren out and the XJ220 twr regain it's original title of the fastest production car in the world. Due to technicalities of course. the McLaren is no longer dubbed a production car, since it produced less than 25 cars. In the near future, it may be possible to see, a newer updated version of the XJ220. A 6.0 V12, with a 6 or 7 speed version has been rumoured to be in a possible prototype form. Stay tuned.