Business as usual in Germany: esteemed tuner G-Power has revealed plans to make a ballistically fast car even more ballistic.

Meet the new, old, 700bhp BMW M5: a yet-faster version of Munich’s last-gen, V10-engined super-estate and super saloon.

The E60/E61 has been treated to G-Power’s new ‘Mono-Kompressor SK II’ kit, which, in short, means a socking-great single supercharger bolted onto the 5.0-litre V10’s M5’s venerable banks.

Though a range of power outputs are available, the one you want is is the SK II, which gets an ASA T1-724 supercharger running 0.5 bar of boost, new intakes, a cast aluminium air box, boost pressure control, motorsport spark plugs, high flow injectors, a racing catalyst, full ECU remap, and a high performance fuel pump.

G-Power will also move the limiter to 205mph, which is nice, and also necessary. Overall, you’re staring down the exciting end of 700 horsepowers and 501lb ft of torque, enough to get it from 0-62mph in… well, we don’t know, actually.

No acceleration figures have been provided, but we’d expect them to be a bit faster than the ‘standard’, 507bhp BMW M5. Depending on traction, you’re looking at a 0-62mph time well under BMW’s official 4.7 seconds, perhaps even dipping under the fours.

G-Power will sell you a twin-supercharged, 800bhp kit for this V10, but argues that the reduction in size and simplicity of installation of this new single supercharger is better. The whole kit - with installation - costs around £18k (€25,000). On top of the cost of your last-gen M5, of course.

Meddling with a future classic, or entirely appropriate upgrade?