Geneva 2011: Alpina BMW B5 Bi-Turbo Touring is a 5-Series Estate on Steroids

Catering to the needs of those looking for an über fast premium station wagon, longtime BMW tuning house Alpina has developed the B5 Bi-Turbo Touring based on the station wagon version of the latest 5-Series. With 507HP and 700Nm (516 lb-ft) under the hood and up to 1,670 liters of storage space, Alpina's creations is a party animal at the front while keeping it...professional at the back.

The Alpina-prepped bi-turboocharged V8 engine accelerates the Touring from 0-100km/h (62mph) in 4.8 seconds and on to a top speed of 303km/h (188mph). A performance braking system with 375mm discs up front and 345mm at the back ensures that the Touring will come to a halt. Power is transferred to the rear-wheels through a modified version of BMW's 8-speed Sport automatic transmission.

A lowered suspension with sports springs and new 20-inch lightweight alloy wheels wrapped around in Michelin Pilot Super Sports tires size measuring 255/35 ZR20 at the front and 285/30 ZR20 at the rear complete the performance upgrades.

As for the styling updates, the Touring benefits from a discrete aero package with a front apron, roof spoiler and a rear diffuser, while interior mods include a bespoke leather treatment for the sports seats and steering wheel, along with blue ALPINA gauges and unique decorative trims.

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VIDEO: AC Schnitzer's Diesel-Powered BMW Z4 and 540HP 5-Series

The new BMW Z4-based 99d roadster and the BMW 550i-based ACS5 sports saloon will hog the limelight on AC Schnitzer's stand at this week's 2011 Geneva Motor Show. Both models were developed to offer performance without compromising on fuel efficiency and CO2 emissions. The Z4 99d comes with a 190HP 2.0-liter turbo diesel engine, while the ACS5 features a 4.4-liter turbocharged V8 gasoline unit pumping out 540-ponies. Scope out the first promotional videos of AC Schnitzer's newest tunes right after the break.

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Geneva Preshow: AC Schnitzer Turns the BMW 550i into the 540HP ACS5 Sport S Saloon

AC Schnitzer has prepared two production ready concept cars for this year's edition of the Geneva motor show. We've already told you about the first car, the diesel-powered 99d that is based on the BMW Z4 roadster, so here's the tuning firm's second proposal. The ACS5 Sport S Saloon is based on the latest BMW 550i sedan and is said to feature numerous performance and styling upgrades, though AC Schnitzer is keeping mum about most of the details.

According to the tuning house, the 550i's twin-turbocharged 4.4-liter V8 engine with 407HP and 600Nm has been modified to deliver 540HP and 750Nm, which helps the sedan model to complete the 0 to 100km/h (62 mph) sprint in 4.5 seconds and reach a top speed of 320 km/h (199 mph). AC Schnitzer said that despite the power bump, fuel consumption and CO2 emissions of the ACS5 Sport S are equivalent to the standard BMW 550i.

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