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I would alway hear a metal chain rattle at about 40 mph. I took the cat to my local auto shop where they tested it on a dynamometer. They found it was the cam phasers needed to be replaced. The car had about 40K miles and was out of Ford warranty, but was still on the powertrain warranty...

I have a 2019 Mustang GT CS that had the same issue. Vibration at slow speed when turning. Had Ford change the rear end fluid oil it completly stopped the vibration. I made sure also included the rear end additive it required. Hope this helps.

I would like to add 25mm spacers to my 19 gt/cs but had issues in the install with the hub studs hitting the original mag wheels. How did you get them to work?