Hennessey Performance, the guys responsible for the astonishing Vettaro, have been having a bit of a tinker with the Cadillac CTS-V. The car that Cadillac hope will rival the M5 in Europe - and, realistically, never can - has had its supercharger removed and a brace of colossal turbos installed in its place; along with various internal tweaks, power is now up to a frankly ludicrous 800bhp. It'll do 0-60 in three seconds and a quarter-mile in ten. The best thing about it, however, is the way it looks... unassuming and non-threatening. If you didn't know any better, you'd be forgiven for mistaking it for a bog-standard CTS-V. And that could lead to all sorts of fun.