Diagnostic guidance. Suggested checks and possible repairs are separate from the owner's reported results.
Record the driving conditions when the rattle occurs, including road surface, speed and whether acceleration or braking changes it. Have the noise localized during an appropriate inspection before replacing exhaust parts. A converter was only one suggestion in this discussion. A noise that cannot be reproduced while stationary needs further investigation rather than a parts diagnosis from the description alone.
Source discussion: question 1713049 https://2carpros.com/questions/rattle-noise-while-driving--1713049 Supports the reported history and outcome only. Follow-up guidance is editorial synthesis; unverified specifications and diagnoses are not adopted.
Rattle noise while driving?
The owner reported an intermittent rattle while driving. Heat shields appeared intact to the owner, and revving the engine while stationary did not reproduce the noise. Internal catalytic-converter damage was suggested, but there was no recording or inspection confirming the source.
Reported outcome: No cause or successful repair was reported.
No audio or video was available in the reviewed material. The owner's heat-shield check does not establish that every exhaust or underbody component was inspected.
