Do i need to do anything to attenuate the the level coming out of the car kit in hardware

I don't know what level is coming out of your car kit. If it is speaker outputs, you will likely need to do something like a speaker-to-line-level converter to attach it to the line level inputs. Depending on how much power is behind that speaker output, you could fry the empeg by trying to connect speaker power to the aux-ins.

I know that two people have just given you contrary advice. I'm just saying that caution is in order because I don't know what kind of amplification is behind the car kit's outputs. Are they speaker outputs or line level outputs?