View Single Post
Old 06-18-2012, 11:19 AM   #4
Registered User
vitaminC's Avatar
Join Date: Mar 2009
Location: NorCal
Posts: 153
I had the same issue. Replaced my 2ndry cats with some aftermarket bypass pipes and now the rattle is gone and the car sounds much better! Those cats are not part of the emissions control loop, so they should not affect smog tests- YMMV.
'03 986S
vitaminC is offline   Reply With Quote