I have a 98.5 SVT with 30K miles on it. I did a search regarding the water pump issue, but did not get the exact answer I was looking for. My question is, does my car have the pump with the plastic or metal impeller? I read one post where somebody with a 98.5 had a metal impeller. Was the plastic impeller on the E0's only? If I do have the plastic impeller, should I begin to think about replacing it? Thanks in advance.