2022 Lexus RX350

What component or system failed or malfunctioned, and is it available for inspection upon request? The exhaust in my 2022 RX350 causes droning and vibrations at 1500rpm while driving at 25-30mph and 55-60mph. Most of the vivrations can be felt at the catalytic converter exhaust assembly. How was your safety or the safety of others put at risk? The vibrations and droning causes a sensory “shock” as the vehicle approaches 1500rpm at 25-30 and 55-60mph. This has caused me to be caught off guard while I am focused on driving on busy streets and on the highway. Has the problem been reproduced or confirmed by a dealer or independent service center? I have brought my vehicle in several times to 3 different Lexus dealerships. I have sat with 2 shop foreman’s and driven with them in which they have said that such vibrations are “normal”. Has the vehicle or component been inspected by the manufacturer, police, insurance representatives or others? The vehicle has not been inspected by any of the above. It has been only brought to Lexus dealerships for inspection (I am not counting dealerships as the manufacturer). Were there any warning lamps, messages or other symptoms of the problem prior to the failure, and when did they first appear? There were no warning lamps or messages prior to the first droning/vibration. The first sign of the droning was the same night I had purchased my car and drove it home. I immediately emailed my dealer about this issue as it felt abnormal compared to the RX350 I had test driven earlier that week.