According to the tuner, the car has set a new record in its class at the Palm Beach International Raceway after running the quarter-mile in 10.652 seconds, at 127 mph (204 km/h).
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With this power hike, the sprint from 0 to 100 km/h takes a mere 2.8 seconds with the top speed increasing to 345 km/h.
The OveRland’s suspension has been changed to make sure it can soak up any off-roading punishment that a driver may throw at it.
That is a substantial 128 hp (95 kw) and 150 Nm increase over the factory standard car.
Unfortunately, only 15 of these bonkers Bentayga creations will be made.
Each of the 25 units that will be made comes in a special color and adds their signature carbon grille.
The new company, m52 (Mountune52), will combine Mountune’s tuning expertise with the design flair of fifteen52, with a host of powertrain, chassis and style products planned for VAG cars coming this year.
Should that be a bit too over the top for you, Gruppe5 Motorsports are also offering a more sensible 744 HP (555 kW) option.
The changes may be subtle, but they just make the looks of the Z4 pop that little bit more.
While Manhart has only released pictures, we can already see some of the exterior modifications that will be taking place.