Originally posted by sprout2287:
The rattling under the car may be caused by the two vents on either side of the inside of the trunk. First, remove the trunk floor piece (the carpeted thing) then pull up on the left or right sides of the other carpeted things. There's a vent on both sides. I don't know what they're for so I taped them up with duct tape. This also increases spl by sealing the trunk more.
Those vents are their to let air escape when you close your trunk to close. If you seal them up you just need to use more force to close the decklid.
