It was 99ssleeper who gave the tip that fixed this problem ... he'd had the same identical scenario. No noise now ... sounds smooth and not raspy thorugh my Borla's.

01-01-2005, 09:38 PM #5 99ssleeper vbmenu_register("postmenu_2256002", true);
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Join Date: Oct 2002
Location: Minnesota
Posts: 608


After I did my headres and ORY, something rattled for a while. I though FOR SURE it was the heat shields.

Turned out it was a slightly loose O2 sensor. As soon as I thightened it, the sound went away. This was an intermittent rattle as you describe...might want to check your O2s......sometimes it is the little metal ring on them that rattles too.
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....sorry Zinc.