This is weird! Just in the last couple of days, my car out of the blue makes this loud coarse rubbing sound and it feels the car is lacking power. Im in Melbourne and coz I had no choice had to drive thru some water over a road. Wondering whether something has got water in it. Where I live this happens heaps of times but only now is it doing it. Checked under the car, all was clear as far as I could see. Doesn't feel like the auto is doing it, its feels and sound like the exhaust is blocked. I really don't know what it is. This ever happened to anyone??