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Old 02-17-2011, 09:01 AM   #3
BYprodriver
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Join Date: Oct 2008
Location: O.C. CA
Posts: 3,709
Garage
The secondary cat heat sheilds are fastened with 3 unique 1/4 turn hexhead capscrews into nutplates. I would just remove the sec. cats 1 at a time & shake to see if something is loose inside & check the heatsheild fasteners to make sure they are secure.
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