BMW is teasing the 2014 M3 / M4 Coupe by offering a glimpse of the all-new straight-six soundtrack.

BMW is teasing the 2014 M3 / M4 Coupe by offering a glimpse of the all-new straight-six soundtrack.

In this short clip we get to hear the sound generated by the S55 six-cylinder, 3.0-liter twin-turbo engine which is rumored to output somewhere in the region of 450 bhp (335 kW) and 405 lb-ft (550 Nm). It should enable both cars to perform the 0-62 mph (0-100 km/h) run in 4.2 seconds and reach an electronically-limited top speed of 155 mph (250 km/h).

Last month, managing director of BMW M Performance Automobiles Friedrich Nitschke said the new M3 and M4 Coupe will probably arrive at next year's North American International Auto Show. BMW will probably reveal a concept M3 or M4 Coupe later this week at the Pebble Beach Concours d’Elegance.

We expect both cars to have an aluminum hood (with power dome) and optional carbon fiber roof and trunk lid. The new M duo will benefit from a torque vectoring differential and a newly developed traction management system which will provide the cars with great traction. This is BMW's way to avoid implementing an AWD setup which would have altered steering and added 80 kg (176 lbs).