The B6 is based on the 650i and uses a modified version of its N63twin-turbochargedV8 engine designated the M2/1. The engine was modified by the addition of new turbochargers with modified exhaust turbines, a BOSCH MEVD 17.2.H ECU, new MAHLE pistons and a larger intercooler. These modifications allowed the engine to generate and of torque. The engine is mated to an 8-speed ZFautomatic transmission with optional limited slip differential and a manual shifting mode called the Sport Shift mode which allows the driver to change gears via buttons located on the back of the steering wheel. The exhaust system is a titanium unit from Akrapovic with quad-exhaust tips and electronically controlled bypass valves. The B6 has an aerodynamic kit that includes a carbon-fibre front spoiler with an integrated front splitter along with an integrated NACA brake cooling duct and a rear lip spoiler and a rear diffuser. The car comes with 20-inch Alpina classic multi-spoke alloy wheels wrapped in Michelin Pilot Sport tyres measuring 8.5 x 20 255/35 ZR20 at the front and 10 x 20 295/30 ZR20 at the rear. The suspension system consists of electronically adjustable dampers and active roll stabilisation with Alpina specific software to control the system. The car has four driving modes, "sports", "sports +", "comfort" and "eco". The car has Lavalina leather interior upholstery and myrtle wood trim as standard. The interior has Alpina logos and emblems throughout along with illuminated door sills, a panoramic roof, Alpina gauges, adjustable vented sports seats, heated rear seats, BMW driver assistance plus including active blind spot detection and a sports steering wheel. Alpina's customisation programme for the interior was exclusive to Europe only. The B6 coupé and convertible came with rear-wheel-drive drive train while the later introduced gran coupe had all-wheel-drive drive train.
Performance
The B6 coupé and convertible can accelerate from in a quoted time of 4.4 seconds and can attain a top speed of. Although independent testing revealed that the top speed was higher than quoted figures and was recorded at thus making it faster than its BMW M counterpart, the M6. The gran coupé, when independently tested, had a acceleration time of 3.7 seconds, acceleration time of 8.2 seconds, a quarter-mile time of 12.0 seconds and a top speed of The Alpina B6 Gran Coupé has slightly less performance but a more luxurious ride than the BMW M6 Gran Coupé.
B6 Edition 50
Unveiled at the 2015 Geneva Motor Show, the Edition 50 is a limited production variant of the B6 available in coupé and convertible bodystyle only. The Edition 50 has a modified version of the 4.4-litre twin-turbocharged V8 engine found in the standard B6 generating a maximum power output of at 6,000 rpm and of torque at 3,500 rpm. This was the most powerful engine ever built by the manufacturer. The 8-speed ZF automatic transmission had a limited slip differential included as standard. The Edition 50 had a lighter Akrapovic titanium exhaust system and 20-inch forged multi-spoke alloy wheels exclusive to the model which reduced the weight by a further. The Edition 50 was only available with classic Alpina blue or classic Alpina Green body colours with optional Alpina pinstripes. The interior had a Forest Green and black Nappa leather upholstery with contrast yellow stitching and ceramic finishing on the centre console paying homage to the 1982 B7 S Turbo. The stainless steel Edition 50 door sills had founder Burkard Bovensiepen's signature. The car had a plaque signifying the production number of the 50 units produced. The B6 Edition 50 can accelerate from in 4.2 seconds. The coupé can attain a top speed of while the convertibile can attain a top speed of
