Here are results from the Sport Auto performance test comparing the 2013 Alpina B6 (F13) versus the 2013 M6 (F13) coupe.
The Alpina B6 Biturbo (
full specs) is powered by BMW's 4.4L V8 engine rated at 540hp and 730nm torque and top speed of 334 km/h.
The M6 features 560hp and 680Nm torque with a top speed of 305 km/h.