What could the noise be? I bought the car around 4 weeks ago at Manheim Auctions Moorebank, it's an ex cop car and I noticed the engine noise around 3 weeks ago, it only comes on after driving the car hard and/or the engine is hot. I've been driving the car with the noise for a while now as it's the only transport I have http://www.youtube.com/watch?feature=player_embedded&v=TzrPhSkQe84 http://www.youtube.com/watch?feature=player_embedded&v=9arE8KdsXno