Okay, I was driving down the road, heard a clunk clunk clunk, and then my exhaust starts dragging (at the bend by the axle). So I take it to the shop where I got it installed like 6 months ago, they straighten it out, and re-weld it, but now any time the body of my car goes up and down, i hear this horrable rubbing noise, could it be the heat shield around the cat? What harm would be done by removing this?
also, when I step on the gas, i feel a slight vibration in the car now..