#Porsche# #The ‘Pornography’ from Singer#This is Singer’s take on the 911 Safari – the All-terrain Competition Study (ACS) – designed in partnership with historic 911 rally expert Richard Tuthill. The donor car is a 964-gen 911 from 1990, the engine a twin-turbo air-cooled 3.6-litre flat six developing around 450bhp, although that can be easily turned up depending on the specific demands of each event.