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I had one on my 3.0i and took it off because it amplified the whistling noise I got at part throttle (barely noticeable with the stock airbox, and I don't think it's a vacuum leak - just an M54ism). The "heat shield" is just a molded piece of plastic. Other than that it's just a K&N cone filter. If you just want the sound of the open filter design then this will get there. The aFe/Gruppe M look much nicer under the hood for a much higher price.
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