Alpina’s B4 S Biturbo has joined the fast high-end coupe race, along with more mainstream contenders including the Mercedes-AMG C63, Audi RS5 and BMW M4. The newbie, which changes the old B4, is based on the M4’s straight six cylinder engined platform, however boasts a raft of visual and performance upgrades.

3/4 view of the Alpina Bi-Turbo Coupe

The majority of headline worthwhile is its 332kw from its N55-based 3.0-litre six cylinder engine. This starts life as the routine unit used in the 3 Series and 4 Series, however boasts a set of 10% larger turbos, a 20% more effective cooling set-up, a 35% larger oil cooler and a forged, lighter crank. It’s all teamed with an eight-speed automatic transmission, which can be manually moved via buttons on the wheel.

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The B4 S’s peak power now comes at 5500-6250rpm, while 487lb ft of torque rises in at 3000rpm. The figures are a 9bhp and 81lb feet increase over those of the M4, and while the 1690kg Alpina is 90kg much heavier than the equivalent BMW, it’s 4.2 sec 0-100kph sprint time is 0.1 sec quicker.

White variant of the Alpina Bi-Turbo Coupe

A white variant of the BMW Alpina Bi-Turbo Coupe

ALPINA B4 DRIVEN

Slightly softer suspension setup than the M4 are rollovered from the B4. Likewise, the maintained BMW Specialist infotainment system adds widescreen sat-nav and overall parking sensing units, and Dakota leather is fitted as requirement. Our test cars and truck’s Merino leather expenses ₤ 1285 more.

The Akrapovič exhaust system emits a more subtle tone than the M4’s guttural roar, and in daily driving in default Convenience mode you’ll get only a tip of the vehicle’s performance potential. Its actions impress, however, and the ‘box alters at 2000rpm in typical city driving.

It’s a various story in Sport, however. Low-down reaction is excellent, and is enhanced by a specified, great-sounding kick-on at 3000rpm and an increase of muscle on each upchange. The Alpina displays different attributes when it pertains to putting power down to the ground too; the M4 has a more abrupt, traction-challenging style, while the B4 S’s shipment boasts more useable flexibility that makes it friendlier when leaving corners at full chat.

While the BMW’s low position and weight benefit give more efficient turning and stopping ability, its actions on slippery roadways can be a tad unpredictable. In contrast, the Alpina’s softer technique makes it a more comfy companion over damaged surface areas, despite the big 20in Alpina Classic alloy rims. It hustles along fast B-roads more easily than the M4, thanks especially to its compliance, superbly weighted steering and super-responsive transmission. The ease and reward of the driving experience becomes even simpler in Convenience mode; whether this makes the vehicle more versatile than the M4, or simply less focused, depends upon your viewpoint.

Price: R 750,000.
Engine: 2993cc, 6 cylinder, petrol.
Power: 332kw at 5500rpm.
Torque: 486lb feet at 3000rpm.
Transmission: 8-spd automated.
Kerb weight: 1690kg.
Top speed: 190mph.
0-100kph: 4.2 sec.
Fuel economy: 15km/ltr
CO2 ranking: 180g/km.
Rivals: BMW M4, Mercedes-AMG C63, Audi RS5.