Solved.
There was no actual problem with the aftermarket cat. I went to a muffler shop and they found the flange seal was leaking, so they sealed it, all the noise went away.
Everyone,
Had a rattle coming from under engine. Used doctor scope to narrow the noise to driver side cat. Bought replaced cat from Rock Auto (Davico Brand)...economy one...The OEM cat is listed at 1400.00 compared with 250.00 from Rock Auto.
Installed no problem, rattle gone.
However, a deep...
Gary from Edmonton, Alberta, Canada.
It's frickin freezing here.
New to the forum, long time Ford guy.
Proud owner of 2008 Expo Ltd, and 2017 Focus Titanium, and 2009 Mustang GT, and 2017 F150 Lariat.
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