I just know that the wind noise is going to drown out most of the engine noise as the camcorder will be mounted on a roll bar above the car. If I had a mic I could hide it out of the air, say at the rear of the car and then record the engine note of the exhausts.

Mind you looking at the price of those recorders I might give this idea a miss !! I might as well buy a new camcorder with a AV IN socket !!