2014 BMW M3 and 4-Series Convertible spied along

One of the most anticipated models, 2014 BMW M3, has been spied recently undergoing testing at the Alps together with the upcoming 4-Series Convertible.

Power will be provided by a six-cylinder, twin-turbo 3.0-liter engine generating around 450 hp (335 kW) and 405 lb-ft (550 Nm) of torque. It should be able to speed to 0-62 mph (0-100 kmph) in 4.2 seconds and would come with an electronically-capped top speed of 155 mph (250 kmph).

The 4-Series Convertible was riding with the top down and had the optional M Sport Package. Engine lineup will probably be the same as the coupe and so expect a 4-cylinder, 2.0-liter engine with 240 hp (179 kW) and 255 lb-ft (345 Nm) of torque, together with a stronger six-cylinder, 3.0-liter with 300 hp (224 kW) and 300 lb-ft (406 Nm) of torque.

The 4-Series Convertible will be unveiled in September at the Frankfurt Motor Show and is expected to go on sale before the end of the year, while the new M3 will come out in early 2014.