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2015 BMW M3 Sedan, M4 Coupe are officially revealed [w/video]

The new 3.0-liter inline-six makes 425 turbocharged horsepower from 5500 rpm all the way up to 7300 rpm.
BMW has announced the 2015 M3 Sedan and M4 Coupe, high-performance versions of the new 3 Series and 4 Series that launched this year. The new Ms have stirred controversy in a variety of ways, but one must remember that the M cars traditionally don't follow a specific mold.

2013 BMW M3 Coupe Lime Rock Park Edition

Sic Transit Gloria
I like difficult cars. I like turbo "moments," dramatic weight distribution, low-grip, peaky power delivery, and overly quick steering, along with ultra-short wheelbases and any number of other non-racecar-perfect dynamic foibles. I love the newest generation of BMW cars and engines - all turbo'd up with tons of torque and power everywhere in the rev range, too. But what I think the enthusiast community will miss when this 2013 M3 Coupe becomes the 2014 M4 Coupe - replacing its idiosyncratic, small-displacement, revvy V8 for something like a triple-turbo, directly injected, inline six-cylinder powerhouse in the process - is the work it takes to drive the car fast and perfectly. Sometimes small flaws just make things better; my mistress' eyes are nothing like the sun, and all that.
The idea of this E92 M3 going away then, magnified by the loss of the M3 badge for the coupe, is at best bittersweet for me. This generation of M car is already surpassed in terms of raw thrills by the better-than-ever Mercedes-Benz C63, a car that doesn't ask its driver to sacrifice low-end grunt or the very latest in amenities in return for stellar backroad performance. Yet any time I've been lucky enough to lap a track in the M3, it has quickly become clear that the Bimmer is the better on-edge tool. With the freedom to wring the neck of the 4.0-liter V8 and room to exercise the lovely balance of the car, the E92 is hard to match (even six years after its debut).

BMW i8's three-cylinder sounds like it's shaping up quite nicely

We've run across some rather interesting news... or perhaps we should say interesting sounds. The folks from Bimmerpost have scrounged up a short video showing a preproduction BMW i8 running through a few gears in Sport mode at a quick pace, and if you were concerned that the somewhat eco-friendly nature of the upcoming German sports car would neuter its ability to stir the aural senses, fret not.
Judging by the lovely noise coming from the engine compartment of the i8 in the video, BMW's expertise in tuning high-strung, small-bore engines - remember, BMW Motorrad has quite the penchant for well-conceived motorcycle engines - has come through loud and clear. Now, it's worth mentioning that BMW's controversial Active Sound technology will be included with the i8, so the production car may not sound exactly like this version, which is running with the tech disabled. Owners won't have the ability to disable Active Sound on production i8s.
In related news, Bimmerpost reports that BMW will equip the i8 with an external Active Sound Design system to go along with its Pedestrian Protection System. That means those on the outside will likely hear piped engine recordings from the rear and a sort of "howl" from the front in order to warn pedestrians that the otherwise quiet (when running on electricity, that is) car is approaching. It will also feature technology that can stop the car before contacting a pedestrian.