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Unlike the M4, the Alpina duo are geared towards providing not only “high-level driving dynamics but also lots of comfort for relaxed touring”. The chassis has therefore been extensively modified in keeping with this billing. 

Upgrades including new bulkhead reinforcement struts, stiffer bushings and mounts, bespoke front anti-roll bars and a unique spring-and-damper configuration among the hardware changes that give the B4 and D4 their distinct characters. Variable dampers are said to give “noticeable differentiation between the various driving modes”, while three different modes of steering response are available.

The brakes have been upgraded, too, with four-piston callipers gripping 395mm discs at the front and floating callipers paired with 345mm discs at the rear. Drilled, lightweight composite discs are optionally available.

As is customary for an Alpina car, the styling differences over the standard 4 Series are much more subtle than those of the M4. Unique bumpers, spoilers, exhaust exits, side skirts and badging are the obvious telltales, plus there’s a new interpretation of the brand’s hallmark 20-spoke alloy wheel design. 

Alpina says a new manufacturing process means these 20in wheels tip the scales at just 12kg each.

They’re wrapped in high-performance Pirelli P-Zero tyres designed especially for Alpina. 

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