Ok -- so I'm on my way back to work today and its nice out (65) and going down the thruway at like 65 -- I rolld down the Back windows---like I used to do when I had a 4 door car before cuz its like all nice and airy but not blowing on u
and I hear like THUMP-FLUTTER-like Tthunder noises -- look in the back seat and the back seat seat back is like um how do i describe it like rattling -- like coming forward and back like someones in the trunk pushing in and pulling back on teh seat back ... it was horrid... do urs do that or some sheeit broken?

 

Mine did this when I used to have my exhaust...

 

I dont think you car likes you.
And no, my car doesnt do that, go in the back seat and see if you can move your seat around..

 

Did the previous owner tell you about any problems with the TL before you bought it from them?

Either you were expecting too much from the car or it's possessed.

 

I have a squeak and a rumbly back seat lol thats half the problems half ya'll had llololl

But yeah if u like pull on it -- it'll pull forward a little bit