The B5 BiTurbo is based on the BMW 540i Xdrive with modified 550i engine. It is the first all-wheel-drive version of the Alpina 5-series since the E34-based B10 3.0 Allrad.

The B5 BiTurbo replaces the previous generation F10-based B5 BiTurbo. Despite innovations such as all-wheel-drive and 4-wheel-steering (Integral Active Steering), the G30 B5 BiTurbo is similar in weight to its predecessor.

The B5 BiTurbo was introduced at the 2017 Geneva motorshow as Limousine and Touring. At the time of introduction, the B5 BiTurbo Touring was the only BMW 5-series Touring available with V8 engine.

The engine in the B5 BiTurbo was introduced in the G12 B7 BiTurbo. It is based on the BMW 550i engine, with custom Alpina engine block, cylinder heads and internal parts. It has been modified to 608hp and 800Nm, with 670Nm of torque available from 2000rpm. The engine is already homologated according to the new exhaust emissions standard Euro 6C, which does not come into force for new models until the end of 2017.

The B5 BiTurbo has a custom stainless exhaust with active exhaust valves.

The only available gearbox is the 8-speed Sport-Automatic transmission (ZF 8HP75) with Switchtronic. All components of the transmission such as the torque converter with lock-up clutch, the planetary wheel sets and the inner cooling are designed to specifically cope with the high torque output of the B5 BiTurbo engine. This means that no torque reduction is necessary during upshifts when utilising Launch Control or when using the sportiest configuration of the Manual Mode. The transmission features the latest Comfort and Efficient Dynamics functions such as Connected Shift (use of navigation data for an anticipatory shift strategy based on traffic routing) and coasting (decoupling of the engine and transmission when coasting).

Optionally, a mechanical limited slip differential from Drexler, assembled by hand and using motorsport grade CNC machined components, is available.

The B5 BiTurbo suspension is based on the 540i Xdrive, modified with Alpina settings and springs.

As a first for any Alpina model, the B5 BiTurbo comes with Integral Active Steering for added agility and safety. This comprises an electromechanical steering system with variable ratio at the front axle and electromechanical rear-wheel steering with a maximum steering angle of 2.5 degrees. At lower speeds the system improves agility markedly by means of the rear wheels steering ever so slightly in opposite direction to the front wheels. At higher speeds the rear wheels steer in the same direction as the front wheels for improved high speed and directional stability.

Wheels are 20-inch forged Alpina Classic wheels with 255/35 and 295/30 (Touring – 285/30) Pirelli Pzero tires. This results in a weight saving of 15kg (or nearly 25%) compared to traditional cast wheels of similar dimensions. For the B5 BiTurbo, Alpina chose to change from the traditional Michelin tires, due to Pirelli developing a specific Alpina version of the Pirelli Pzero tire. Pirelli tires were last fitted as original equipment on Alpina models in 1985.

The brake system of the B5 BiTurbo consists of four-piston fixed brake calipers and 395 mm discs on the front axle and floating brake calipers with 398 mm discs and an electromechanical parking brake on the rear axle. Optionally, a high-performance brake system is available, which combines lightweight drilled composite discs with high performance brake pads for even more fading resistance.

The B5 BiTurbo undergoes the same interior changes as usual with Alpina. Cluster gauges are custom Alpina with classic blue background combined with steering wheel trimmed in Lavalina leather. Additionally, interior trim is fine Alpina wood or piano lacquer with Alpina logos. A no-cost option are Alpina badges in the seats. Optionally, a custom interior in Lavalina leather can be ordered.

The full-colour digital instrument panel in LED technology features a distinctive ALPINA design. In Comfort mode it offers a classic look: instruments with a blue background, red needles and clearly legible figures. In Sport mode the display changes to dynamic style with green drag indicators. It is also possible to select an Eco Pro mode. A typical Alpina feature is the centrally positioned permanent digital speed indicator.

For the exterior, the changes are limited to an Alpina frontspoiler, rear diffusor and Alpina badges on the rear. The sedan version has a rearspoiler. A non-cost option is the classic Alpina decor on sides of the car and frontspoiler. Available exterior colors include Alpina Blue II and Alpina Green II.

Acceleration from 0-100kph is 3,5 seconds, from 0-200kph is 14,3 seconds.
Top speed for the sedan is 330kph and for the touring 325kph.

This performance makes the B5 BiTurbo the fastest Alpina ever produced.