The flagship X7 is BMW's largest and most luxurious SUV on sale today, but the automaker currently has no plans to give it the high-performance M treatment claiming there isn't enough demand to justify it. However, a recent report claimed that BMW is working on an even more lavish X8 range-topper that will be sold exclusively as an M Performance and full-fat M model. It will likely be BMW's most expensive model ever, but this still leaves a void for the X7 M to fill. Enter Alpina, the German automaker that specializes in building luxury high-performance BMWs.

We got our first look at the upcoming Alpina XB7 last year, but more camouflage has peeled away since then giving us a clearer look at the high-performance SUV. The prototype is finished in Alpina's distinctive dark metallic blue finish and features a new front bumper with a deeper spoiler lip.

At the back, Alpina's signature typical quad exhaust pipes are integrated in a re-designed rear bumper. We still don't have any photos of the cabin, but the interior should be even more luxurious than the standard X7, which is no small feat considering this is BMW's flagship SUV.

Alpina's X7 M alternative will arrive in two versions. An inline-six diesel-powered variant will be sold in Europe with around 450 horsepower, while America's model will utilize a 4.4-liter, twin-turbo V8. In the standard X7, the V8 unit produces 456 hp and 479 lb-ft of torque, enabling the large luxury SUV to accelerate to 62 mph from a standstill in 5.2 seconds.

Alpina's XB7, on the other hand, is expected to increase the output to 600 horsepower. The revealing spy photos suggest a reveal is imminent, so we could see the Alpina XB7 make its world debut at the 2019 Frankfurt Auto Show in September.