Just want to add that I had a horrible rattling / buzzing sound at idle and driving in reverse. I popped the hood and it was my G3 Stillen Intakes buzzing up against some metal. So I addressed it and problem solved. It was much more noticable after my FI CBE exhaust was installed since it vibrated the car more.
Just saying... check under the hood as well, you never know.
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Stillen G3 Intakes | F. I TDX
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