I can tell you that's exactly the cause of my initial rattling too...I have ERZ HFCs as well. The plugs are just hand-tightened when shipped, so you need to get under there and tighten them up. They will loosen quite quickly with a bit of driving otherwise, so don't wait too long to do it.
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2012 GT-R Black Edition Jet Black
2010 370Z 40th Anniversary // SOLD
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