The German tuner, which has now been completely replaced by BMW, has elevated the performance of the 4-series Gran Coupe to the M4 level while retaining its luxurious feel.
The BMW Alpina B4 Gran Coupe produces 22 horsepower more horsepower than the standard M4 and 59 pound-feet of torque than the competing model.
Alpina claims a sprint speed of 0 to 62 mph in 3.7 seconds and a top speed of 187 mph.
BMW will not confirm whether the B4 Gran Coupe will be sold in the United States.
Earlier this month, BMW took full control of Alpina, the German regulator that makes luxury and fast Bimmers and has had a symbiotic relationship with BMW for decades. Now, Alpina has unveiled its latest BMW-based product, the Alpina B4 Gran Coupe, which enhances the performance of the four-door four-seater to create the closest thing to the M4 Gran Coupe.
Like the M4, the all-wheel drive B4 uses a twin-turbocharged 3.0-liter straight-line 6-cylinder engine, tuned by Alpina to produce 495 horsepower. This puts it between the standard 473 hp M4 model and the 503 hp Competition model. But Alpina’s massive 538-pound-foot torque far exceeds the Competition’s 479 pound-feet. It uses a modified version of the ZF eight-speed automatic transmission and Alpina claims the B4 can reach speeds of 62 mph in 3.7 seconds, three-tenths less than BMW claims for the all-wheel drive M4 competition. The B4’s declared top speed is 187 mph.
Alpina’s sport suspension consists of specially developed front anti-tipping bars and a unique spring and damper configuration, aiming to deliver a smooth ride at high speed. There is also an electronically controlled rear slide restriction differential, and the B4 receives a unique Alpina exhaust system.
The B4 gets small aerodynamic improvements, with subtle front and rear air intakes and diffusers sandwiched between the four oval exhaust ends. The classic 20-inch Alpina turbine wheel is encased in Pirelli P Zero tires developed specifically for Alpina. The interior is covered with supple Lavalina leather, a unique sports steering wheel and a variety of luxurious standard equipment including the heating steering wheel and driver assistance features.
BMW will neither confirm nor deny the availability of the B4 Gran Coupe in the United States when asked, but has confirmed to Car and Driver that “there has been no announcement by BMW of the 4 Series-based ALPINA model for the United States” In Europe, deliveries will begin this summer and the B4 will cost the equivalent of around $100,000.