The BMW M5 is already quite the sedan. In short, it's big, fast, and arguably the benchmark in the rapidly dwindling fast saloon segment. In stock form, a new M5 will produce 600 hp from a 4.4-liter twin-turbo V8, and easily outpace pretty much anything this side of a Porsche 911 Turbo. Apparently, the folks over at German tuning house Manhart don't think that's enough.

This is the Manhart MH5 800 Black Edition. A mouthful, yes, and it'll probably hit 60 faster than you can say its name- the benchmark of a truly fast car. This isn't the first time Manhart has fiddled with the M5 platform either, with the MH5 GTR turning an M5 CS into a one-off 777 hp monster. This one is decidedly more batshit than even that car was making 815 hp and 759 lb-ft of torque.

Manhart got such an absurd set of numbers by upgrading both of the M5's turbos, easily exceeding the performance of the BMW X5 M that Manhart build around this time last year. Additionally, changes include a carbon airbox, gearbox and ECU software, and a new intercooler. The tuning company also uses a stainless steel exhaust system from the catalytic converter back, which ends in carbon tailpipes. Finally, a 200-cell catalytic converter and new downpipes help the MH5 Black Edition get noisy.

Then there are the almost Alpina-esque wheels. They're a set of Hammann Anniversary EVO Black Line wheels, measuring 9x21 in the front and 10.5x21 in the rear. The mad lads from Munich have also fitted some Pilot Sport 4 S tires to provide some semblance of grip for this torque monster. Suspension-wise, not much is changed, with a simple set of H&R lowering springs and a new setup helping the MH5 stay planted.

A host of aesthetic changes help differentiate the Black Edition from the brand's "normal" MH5 800. Custom Manhart badging adorns much of the car's exterior, from fender badges to a Mahart logo perched atop the carbon fiber hood. Of course, the black and gold color scheme is also a bit of a theme with Manhart Black Edition models and includes gold brake calipers in addition to the accents you see on the car above.

Manhart has applied a new carbon splitter, spoiler, and diffuser to the car. Inside, the carbon carries over to just about anything that wasn't already carbon fiber, including the dash and door trim. There's also new Manhart-branded floor mats and CFRP shift paddles.

We can't really say a sedan with this kind of presence looks subtle in any way, but much of the MH5's changes don't drastically alter the outward appearance of the car, with the exception of the hood scoops. All in, you're looking at $16,602 for the full MH5 Black Edition experience. Frankly, that's a lot less than we thought given the upgrades list. At least you know it'll be fast.