hey guys, i just installed a cutout on my car and after i re-capped it, i noticed a rattle coming from the rear of the car around the rear quarter panel area on the driver side. What could this be? Is there anything that might have came loose on that side of the car, because i cannot really locate the source of the sound. PLEASE help, i cannot stand that annoying sound, and do not want to run open all the time...thanks.

 

the cutout could be banging the floorboard....

 

no, that definitely isn't it, it is at the rear of the car....anyone?