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Noticed today, that when I start my car up( cold start only) that's there's a annoying rattle that's lasts for about 10 seconds then disappears, has any one else had this problem? I had a 3 inch downpipe fitted a few weeks ago with the standard nuts going back on, could it be a loose bolt or something worse? Thank you
 

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i had the same problem

on the downpipe bracket a bolt was slightly loose and the washer was vibrating

tightened back up and rattle gone
 

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Yeah only ever on cold startup would disappear after the warm up cycle had finished

If you look underneath at the bottom of the downpipe theres a long bracket, it was one of the top bolts that was slightly loose which caused the washer to rattle
 
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