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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.

Pushrods and overhead valves or dual overhead cams; naturally aspirated, turbocharged or supercharged; it simply doesn't matter – there's nothing quite like the sound of a powerful V8 engine. Or is there?

Here's an interesting tidbit we missed while scouring through BMW's massive press release on the 2012 M5. According to the text, BMW has employed a system it's calling "Active Sound Design" on the new M5, which takes in engine speed and load data from the ECU and plumbs it through the stereo to play a real-time recording of the M5's engine.

BMW sound engineer Manuel Reichle and the 635d – Click above for high-res image gallery

BMW sound engineer Manuel Reichle and the 635d – Click above for high-res image gallery

Manuel Reichle, Sound engineer, and the BMW 635d – Click above for high-res image gallery

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