Replaced shocks, now vehicle is very loud.

Before the shocks were replaced, the cabin was quiet. The shocks are MB replacement.
After the shocks have been replaced, the cabin is overcome by road noise. On the interstate, at 75 MPH, you cannot carry on a conversation between the front and rear passengers.
Any thoughts as to what caused the increase in noise? Is there a body plug that was not replaced, or insulation that is missing?

Bob


