Reply to "nap 300 dr"

Well I'm experiencing just the opposite. I've done the Dr upgrade on my 300 and I'm very disappointed by it. It sounds shut in and with lots of siblence. The 300 sounds much better before the upgrade. The 552dr helped but it still sounds wrong especially after warming up. I've brought up my concerns to my dealer and he reckons it's part of the running in process. 

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