Alpina B3 S Biturbo E90

The BMW Alpina B3 S Biturbo E90, introduced at 2010 Geneva Motor Show as high-performance variant of fifth-generation 3 Series sedan, features extensively-modified twin-turbocharged 3.0-liter inline-six engine producing 400 horsepower (294 kW) at 6,000 rpm and 540 Nm (398 lb-ft) torque at 4,500 rpm, representing significant 40 horsepower and 40 Nm increase versus standard B3 Biturbo through enhanced turbocharger specification and engine management calibration. Performance-focused engineering achieves 4.7-second 0-100 km/h acceleration and 300 km/h (186 mph) top speed, transmitted through Alpina Switch-Tronic six-speed automatic transmission with optimized shift programming for both comfort and sport driving modes.

The B3 S represents Alpina ultimate expression of E90 platform potential combining twin-turbo forced induction with naturally-aspirated engine smoothness, featuring redesigned front spoiler, distinctive 19-inch multi-spoke Alpina Classic wheels sourced from B7 sedan, and revised rear diffuser with quad exhaust outlets. Available exclusively in sedan body style versus standard B3 offering including Touring and Coupe variants, the S specification competed against contemporary BMW M3 E90 with emphasis on autobahn grand touring capability and low-end torque delivery versus high-revving V8 track focus. Popular among enthusiasts for 300 km/h unrestricted capability, Alpina exclusivity, and comprehensive BMW factory warranty coverage, the E90 B3 S Biturbo represented final development of pre-F30 generation 3 Series performance with improved fuel efficiency achieving combined 9.5 L/100km consumption despite supercar-level velocity.