The iQ-derived Cygnet minicar uses the 1.3-liter, 97-horsepower motor provided by Toyota, but it's apparently been found that there is room enough in that engine bay shoebox for Aston's 6.0-liter, 510-horsepower V12 "without extensive modifications." The changes necessary to fortify the rest of the Cygnet to handle a detuned iteration of the V12 haven't been divulged, but they are apparently "not insurmountable."
Autocar compares the concept of a V12 Cygnet to that of the Nissan Juke R. But whereas the latter offered Juke roominess with Godzilla power that made us go, "Hey!", the idea of a hot rod Cygnet – a Cygnet, mind you – makes us go, "Hmmm." For now.
http://www.autoblog.com/2012/10/26/aston-martin-cygnet-with-v12-power-possible/