Check out my post on ITB07-007a TAPPING NOISE FROM DASH AREA
https://www.myg37.com/forums/tsb-technical-bulletins/181172-itb07-007a-tapping-noise-from-dash-area.html

 

this issue i notice on the day of delivery lol

i was like facccck, pull the hook up and problem solve.

I'll check the rear seats and make they r lock

and i'll also mention the muffler thing on my next service appt


**Just check my VIN its b4 120021

I guess i fit in there

 

another update,

took a quick drive to get lunch and guess what i notice!!

the rear seat was NOT lock, so i slam that baby in there and its now secure

wasnt able to find a pot hole to go over to see if can hear anything
*its funny when u r looking for potholes and u dont find one haha

i'll keep this updated soon

 

come to the SF bay area - plenty of crappy roads...

 

Or the Clear Lake area in Houston, roads suck a$$!!!!!!!

 

I think that was your problem, because it was for me when I took delivery of my car. I guess they forgot to lock the back seat when preparing the car for delivery.