Alpina trotted out its upcoming B6 Gran Coupe for some Spring time testing and we’ve caught it fitted with Alpina front lip, trunk wing, wheels and exhaust system. The aero parts remain unpainted and no Alpina rear diffuser/bumper has yet been installed.

For an idea of what the specs may be for the B6 Gran Coupe, the 2013 Alpina B6 Coupe features 540hp / 730nm (538 lb-ft) torque, with a top speed of 334 km/h - based on BMW 4.4L V8 motor. How do those specs stack up against the M6 in the performance department? Check out the Sport Auto comparo results below.

Sport Auto has released a top speed run video of the Alpina B6 Biturbo, powered by BMW’s 4.4L V8 engine rated at 507HP / 700Nm torque and top speed of 334 km/h. For comparison, the new F12/F13 M6 features 560hp and 680Nm torque with a top speed of 305 km/h.

Promotional video featuring the Alpina B6 with its V8 producing 540hp (397kW), with a maximum torque of 730Nm from 2800 to 5000rpm. The exhaust system is by Akrapovic. Full technical details can be found inside.

When it comes to BMWs, the 2012 6 series has been the aftermarket tuners’ choice at the 2011 Frankfurt IAA. Two of these debuting at the show are the Alpina B6 Biturbo and the Hamann 6 series. Info and galleries inside.

The Alpina B6 based on the 2012 6-series (F12) prototype has been spotted for the first time, on the streets of Germany. Typical to form, this B6 prototype can be identified by its Alpina wheels, quad exhaust, and lack of M style aero parts (meaning it’s not an M6 prototype). This prototype does not yet feature the eventual Alpina bodywork.

Expect the F12 B6 to feature the same powerplant as the F10 B5 (based on the current F10 550i sedan) - a 4.4L twin-turbo V8 good for 507hp, but perhaps with slightly upgraded power output.

The Alpina B6 based on the all new 2012 F13 coupe is imagined in even more detail in this stunning rear-view render by philip.

Harold Wood is certainly getting better and better with his renders, this time he brings the magic of Alpina to the all new 6 Series. Not only is his render spot on, but I think the classic Alpina wheels, color and aerodynamics compliment the shape of the 6 series perfectly, and I predict such a car would be an instant classic. Make sure to check this render out!!