vibration or shaking

I took my Mazda3 CPO back to the dealership a week after purchasing it since the shifter vibrates while accelerating in the 3rd gear. They replaced the shifter assembly, however that obviously did not solve the issue. I took the car back to them and fought to get them to acknowledge the issue...

What's up guys this is my first post on this forum! I'm hoping that being a part of this will help me take care of my car better. I like to listen to trap music, therefore am really into a lot of bass. I have a '15 5-door w/o Bose speakers and they're starting to make parts in my car vibrate...

So, I only had my new Mazda 3 S Touring for less than 3 months when a truck driver hit the back driver's side of my car :( .... So, I took it to one of my insurance-company-affiliated auto body shops for full repairs. The repair total came to almost $6000. The entire left quarter panel, rear...