The Alpina B5 Biturbo was recently unveiled at the Goodwood Festival of Speed. Based on the new F10 5-Series, the B5 Biturbo will offer blend of luxurious performance, elegant styling, sporty handling and exclusivity.

Under the hood is a 4.4 litre twin-turbo V8 originally found in the 550i. In Alpina tune, it produces 500hp and 699Nm of torque which is channeled through a modified version of the ZF’s eight-speed automatic gearbox. You can expect a 0 to 100 figure in just 4.7 seconds going on to reach an unrestricted top speed of 307km/h.

Alpina’s power figures are high but not as high as BMW M’s version of the 4.4 litre twin turbo with their very own special exhaust manifold. The M version of the engine makes more power as seen in the BMW X6 M – 555 horses and 680Nm of torque.

Internally called the N63, the exterior will feature elements synonymous with Alpina, such as the oval four tailpipes, larger air vents incorporated into the bumper, along with classic Alpina multi spoke wheels.

At the moment, this is the fastest F10 5-Series money can buy as the M5 (which will like be powered by the X6 M’s engine) is schedule for release in 2011. The M5 is said to be set to produce anything from 555hp (like to X6 M) to 600hp. Unfortunately no official pricing has been announced for the B5, but it is expected to be in the region of £65,000 in the UK.

More pictures are available after the jump.

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