I was under the impression the Cerbera was much more closely related to the Chimera than the Tuscan. The Speed 6 Cerbera, which I believe the thread was started about, happens to be pretty much the same as the 4.2 and 4.5, with the exception of the more orthodox engine, as opposed to the speed eight series. Other differences include softer suspension, higher profile tires, and less powerful brakes. Of course, this is all completely relative, when you compare even a Speed 6 to an Aston Martin or Ferrari, you have a truly different breed of GT.