German tuning company G-Power is claiming to have set the record for the world’s fastest sedan with a BMW M5. G-Power’s M5 Hurricane RR achieved a top speed of 372 km/h (231 mph) beating its own record of 367.4 km/h (228 mph) set earlier this year. But it’s not just the two-ton vehicle’s top speed that’s impressive – it can accelerate from 0 to 100 km/h in 4.35 seconds, up to 200 km/h in 9.5 seconds and up to 300 km/h in 25.8 seconds.

To achieve such impressive numbers the company redesigned the twin supercharger system of the Hurricane RR’s V10 engine, replacing the two ASA T1-313 superchargers used in the previous record holding RR with larger ASA T1-316 units. They are both belt-driven and provide the engine with 25 percent more space for air volume. G-Power says the increased air volume being transported by these modified superchargers is able to generate a theoretical power output of more than 900 hp.

The engine boasts a power output of 800 hp/588 kW, available between 7,500 and 8,000 rpm, and delivers its peak torque of 800 Nm at 5,000 rpm.

The inner workings of the 10-cylinder, four-valve engine are optimized by light, precisely balanced MAHLE high-performance forged pistons with lower compression and increased mechanical strength. The company says it also replaced the standard connecting rods and piston pins because they weren't up to the considerably increased forces found in the engine.

In addition to the most powerful BMW engine ever being fitted to a street-legal M5, the Hurricane RR is also fitted out with the G-Power “HIGHLINE” body kit, which provides increased downforce as well as significantly more air flow to cool the engine. The body kit consists of front and rear skirts and spoilers, doors render and the rear spoiler.

The Hurricane RR also features a G-Power high-performance brake system and height-adjustable G-Power RS coilover suspension that is adjustable for both compression and rebound in nine settings.

Michelin provided 19-inch high-performance Pilot Sport tires for the world record run, but the Hurricane RR runs on 20-inch Silverstone CLUBSPORT wheels for everyday use – you know, taking the kids to school and picking up the groceries.

Inside the car features a speedometer reading up to 400 km/h, clear-coated carbon-fiber panels for the dashboard, center console and door panels, and an ergonomically shaped G-Power sports steering wheel with specially perforated Kjerba Nappa leather.

The G-Power Hurricane RR can only be ordered as a complete car with only five cars to be made available worldwide – hence a 300,000 Euro price tag (approx. US$385,250). Although any current M5 model – sedan or station wagon – can be fitted with individual components found in the Hurricane RR.