Vibration Service Bulletin

[quacktoduck]

was getting my 20K service and guess there is a service bulletin for vibration. there is something they touch in the ECU as well as new exhaust hangers/bushings.

ill ask for the TSB number but if anyone is feeling intermittent vibration at idle

 

[rocksallday]

It's been reported before and only applies for some serious case of vibration during idle.
The TSB also specifically mentions that this should not be done to cars that don't exhibit this behavior, implying it's not a general improvement but rather a change of harmonics via idle RPM and length of rubber exhaust hangers. I'm guess something in the system is pretty close to its natural resonance frequency at idle.