This is a reply to an earlier post. I had the same problem as Scott...Does anyone else have this problem with the 2002, Honda Civic EX, 4dr, 5 speed Man. When driving through puddles the water splashes on the exhaust and has a loud noise, the noise you would hear if a car had no exhaust. As it dries, 30 seconds, it goes away. Honda knows of this issue and calls it a "characteristic of the car". They said not to worry and left it at that.
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