BMW's so-called official aftermarket tuner, Alpina, will reportedly debut the new B3 sedan next March at the Geneva Motor Show. Based off the current 3 Series, Autocar is claiming that it will come powered by a revised 3.0-liter twin-turbo inline-six with around 400 horsepower and 400 pound-feet of torque available from only 1,300rpm. The initial market plan is to offer the next B3 as a sedan only but expect to see coupe, station wagon and convertible versions arrive in the coming years.