The power upgrade involves a tuning of the 3.0 liter twin-turbocharged inline 6-cylinder unit, capacity of 400 hp and 539 Nm of torque. That’s not too shabby, given that the stock unit makes 340 hp and 450 Nm of torque or 500 Nm with overboost.
On the inside, Kelleners adds a three-spoke sport steering wheel, aluminium pedals and foot rests along with velour floor mats. Bespoke interior finishes in leather with wood trims are also on offer by individual customer request.
Wheels are available in 19-inch and 20-inch. Customers can choose between two models, ‘Hamburg’ or ‘Berlin’. Last but not least, special lowering springs reduce the ride height of the Z4 by 20 mm at the front axle and 10 mm at the rear.
