Steve Sutcliffe of Autocar UK test drives the ALPINA B6 BiTurbo.
The B6 BiTurbo gets the typical ALPINA treatment with a more aggressive and sporty bodykit, along with exclusively designed wheels (20-inch wheels and uses 255 millimeters wide tires at the front axle and 285 mm wide a the rear) and other visual upgrades.
The new B6 BiTurbo uses a tuned-up version of BMW’s 4.4 liter Twin-Turbo V8 engine found in the 650i model. The Buchloe-based automaker is using Mahle pistons, a high-performance cooling system and revised ZF 8-speed automatic transmission. The B6 BiTurbo produces 540 horsepower from the standard 407 hp and the torque sent to the rear wheels accounts for 516 lb-ft (700 Nm). The M6 outputs 555 horsepower and 502 lb-ft of torque (680 Nm).
Here is an excerpt from the review:
On the road the B6 feels massively rapid, thanks mainly to the torque it produces from seemingly any engine speed and in any gear. The way the transmission manages the flow of energy is truly epic, and it gives the B6 a blend of smooth but monumental acceleration that no factory BMW, not even the M6, could hope to replicate on the move.
The exhaust note is rather delicious too, Alpina’s modifications gifting the B6 with a depth and range of noises that are endlessly entertaining to listen to.
Despite the chassis modifications, the B6 always feels like a fairly big car on the move. Its kerb weight of 1870kg means it is always going to fight a losing battle against the forces of inertia that swell during rapid direction changes or, indeed, under braking.
The steering is a touch distant in its feedback, too, even though the front end always feels planted – as does the tail – if and when you aim the B6 at a high-speed corner with some enthusiasm.