Original sentence: But still unconfirmed, due to the lack of proper testing, under credible variables.More than a century later, in September 2007, the SSC Ultimate Aero TT allegedly registered the latest record, for a production car, of 412 km/h (256.18 mph).Registered by Dewetron GPS data aquisition.The car has still to be submitted to proper testing conditions.Until then, it is the Bugatti Veyron, the world's fastest street-legal car, with an officially registered top-speed of 408.5 km/h
Edited sentence: Confirmed by Dewetron GPS data aquisition.More than a century later, in September 2007, the SSC Ultimate Aero TT registered the latest record, for a production car, of 412 km/h (256.18 mph)