G-Power unleashes 640bhp BMW M5

It's customary to start any article about the tuning of an already very powerful car thus:

"[Very powerful car] not fast enough for you? Well, the [obscure tuner] version of [very fast car] should be right up your chuffing street. The [obscure tuner] [very fast car] has more power than a [Porsche 911/Ferrari 458/Lamborghini Gallardo]!"