Internal muffler rattle?

[888mustang]

I have a 2015 V-6 and I hear what I think is a internal muffler rattle in left rear on deceleration. Just wondering if any else had this problem and what they replaced.It looks like the resonator and mufflers are a one piece assembly or do they cut it and just put on a muffler? Thought I saw a thread on this but could not find it.

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[jasonstang]

Either heat shield rattle or broken catalytic convertor.

 

[SkattrBrane]

There was a thread on this exact issue. If I remember correctly, it was a fin inside the muffler that had broke a weld and was rattling around. The thread was something about a noise while backing out a driveway. Hope this helps.

 

[FordTechOne]

SSM 45172

2015 3.7L And 5.0L Mustang- Exhaust Rattle, Knock Noise
Some 2015 Model Year Mustang vehicle built on or before 3/30/15, equipped with 3.7L Duratec 4V and 5.0L Ti-VCT V8 engines may exhibit exhaust rattle/knock noise emitting from the muffler resonator. Elevating idle to 1500 RPM and performingthrottle tip-in, tip-out events in neutral will assist in confirming noise concern and is not to be confused with an exhaust leak that was addressed with a previously released TSB on 2015 Mustang 5.0L Ti-VCT V8 equipped vehicles. Updated muffler resonator assemblies are now available to resolve vehicle concern. Reference Workshop Manual Section 309-00B or 309-00C Exhaust System for component location and Removal and Installation procedure.

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