Details about the new Alpina XB7 2021: a large SUV based on the BMW X7 will replace the luxury Mercedes GLS

Alpina pumped up the BMW X7 to create the XB7 large luxury SUV.

Alpina has lifted the silk on its latest model, the X7-based XB7 large luxury SUV that will sit at the top of BMW's line of SUVs with added performance and luxury.

The XB7 is powered by the familiar 4.4-litre twin-turbocharged V8 petrol engine also used in the M versions of the X5/X6, 8 Series and 5 Series, but under the Alpina bonnet, the engine delivers 457kW/800Nm.

That's 3kW less but 50Nm more than the X5/X6M, M8 and M5 competition versions.

With power sent to all four wheels via an Alpina-tuned eight-speed automatic transmission, the XB7 can accelerate from zero to 100 km/h in just 4.2 seconds and reach a top speed of 290 km/h.

However, the high volume and the V8 petrol engine don't come without a cost, in this case fuel economy rated at 13.9 liters per 100 km. CO2 emissions, meanwhile, are pegged at 316g/km.

Other changes to the XB7 include the addition of two water coolers and a larger transmission oil cooler, paired with a boosted engine.

The Alpina XB7 also boasts a retuned air suspension with a 40mm lower ride height, a new steering setup, a stainless steel sports exhaust, an electronically adjustable limited slip rear differential and 23-inch wheels as an option.

Inside, all seven seats are upholstered in Lavalina leather, while the iDrive controller is complemented by crystal glass with a laser-etched Alpina logo.

The Alpina XB7 is due to land on Australian shores early next year, though pricing and specifications have yet to be determined.

Expect the Alpina-tuned model to rank above the standard X7 range, which tops out at $175,900 before the road costs of the M50i variant.