After installation on my 2009 BMW e81 120d M sport, the car at idle is quieter, but real noticeable difference is the throttle! Throttle is smoother and the car picks up speed faster, you can tell the intake is getting more air and the turbo is liking it :). Pipercross is the way to go if you have a BMW diesel and want to keep your car looking factory stock (the best stealth mod)
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