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Alpina B4 Bi-Turbo Convertible

Alpina is well known for their re-worked versions of BMW cars. While in the past they aimed to produce a more distinguished alternative to BMW’s M cars the latest generation offer something a bit different. The Alpina B4 Bi-Turbo Convertible has an upgraded version of the 435i engine designed for both power and economy thanks to a twin turbocharging system replacing the normal twin-scroll unit. To withstand the extra stresses bespoke components include a sophisticated cooling system and a new, forged steel crankshaft are fitted.

The 3-litre engine offers nearly as much power and even more torque than a BMW M4, but the intention is not to make a track orientated car. The B4 has been developed to give useable power that is effective under normal road driving conditions. A four-wheel-drive version is also available for left-hand drive markets which further reduces the 0-100km/h time by a couple of tenths.

The suspension springs and anti-roll bars are firmed up to give more responsive handling without losing the focus on real world performance and comfort.

Styling is subtly changed to give the car a distinctive look without standing out as heavily modified. Bespoke leather upholstery and luxury carpets come as standard and there are plenty of Alpina logos dotted around the interior to remind you that it is something special.

The acoustically insulated metal convertible roof can be closed in just 20 seconds at speeds up to 18 km/h (11 mph).

Alpina B4 Bi-Turbo Convertible Details

Production Dates2014-current
Length 4640 mm / 183 in
Width 1825 mm / 72 in
Height 1380 mm / 54 in
Wheelbase 2810 mm / 111 in
Luggage Capacity 370 litres / 13.07 cu ft
Fuel Tank Capacity 60 litres / 15.9 US gal
Warranty 2 years or unlimited miles

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Fuel type Unleaded Petrol
Driven Wheels Rear-wheel-drive
Engine type Straight 6
Engine Capacity 2979 cc
Power 440@5500 bhp
Torque 660@3000 nm
Transmission type 8-spd auto
Kerb Weight 1915 kg / 4222 lb
UK Retail Price from £67,000
UK Insurance Group 42E


Max speed (auto) 189 mph / 304 kph
0-100kmph (auto) 4.3 seconds

Economy and Emissions

EU Combined Fuel Economy (auto) 34 mpg / 8.3 L/100km
CO2 Emissions (auto) 190 g/km

Information last updated

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