This is the Alpina B4 Gran Coupe, and it might be the closest thing to an M4 Gran Coupe the world will ever see.
The basis of the B4 Gran Coupe is an ordinary 4 Series Gran Coupe. It gets a 3.0-liter twin-turbo inline-six engine that produces a strong 495 horsepower and 538 pound-feet of torque. For those counting, that’s more torque than both the regular and Competition versions of the M3 and M4. Alpina supplied turbos, a larger intercooler and a new intake tract are the highlights. In addition, it is equipped with an Alpina stainless steel exhaust system with the usual quad exhaust protruding from the rear.
The rest of the design is exactly as we would expect from an Alpina product. Changes between the regular 4 Series Gran Coupe and this car are limited, but you get a unique Alpina-branded front spoiler, rear spoiler and a special rear diffuser. Of course, the B4 is equipped with Alpina’s iconic wheels. The 20-inch and 20-spoke forged wheels weigh just 26 pounds each. When it comes to the color palette, Alpina’s usual blue and green options are available, but you also have a wide range of normal BMW and BMW Individual colors to choose from.
In terms of performance, Alpina adds unique front anti-roll bars and also applies adaptive dampers and springs specially set and tuned for this model. It also modified the front camber to provide better handling.
The steering system of the 4 Series Gran Coupé has been re-tuned by Alpina and offers a single Comfort and two Sport modes. Pirelli P Zero performance tires are fitted on all four corners and have been specially adapted for the B4 as they carry the “ALP” code on the sidewall. Alpina says it has placed equal emphasis on ride comfort and dynamic capability when specifying the tires. Alpina brakes provide good stopping power, but if the standard system isn’t enough, an optional carbon-ceramic disc package is available for even better performance.
You’ll be pleased with those excellent brakes, as the B4 is capable of completing the 0-100km/h sprint in just 3.7 seconds. It will go to a top speed of 187 mph. Only an M3 or M4 with xDrive all-wheel drive will be able to beat that acceleration, so yes, the Alpina B4 will be blazing fast. All shifting is handled through a modified eight-speed automatic transmission. Alpina does the final tuning on shifting comfort and dynamics. Meanwhile, components like the torque converter and wheelset have been beefed up to handle the extra torque from this inline six. And in case it wasn’t already clear, the B4 is all-wheel drive only.
The interior features the usual Alpina adjustments. BMW branding is being replaced by Alpina branding throughout. You get a Lavalina leather-wrapped steering wheel and you can optionally upgrade all the leather on the seats to Lavalina in almost any color you want. The production plate of the Alpina is located in the center console and shows the specific construction number of the car.
Pricing for the B4 Gran Coupe isn’t available at this time, but it won’t make much of a difference to US customers as the car doesn’t appear to be destined for North America. We asked BMW, and a spokesperson told us that there are currently no plans to bring the car here. As such, it remains a European forbidden fruit.