scratching sound when reving above 3000 rpm
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Its probably a heat shield that has worked its way loose. Jack up your car when it is cool and check to see if any of the heat shields on the exhaust are loose. If a heat shield is loose between the exhaust and the ground you can usually just take it off, but don't park in tall grass or you may start a fire. If the heat shield is between the exhaust and the vehicles body, I wouldn't reccomend taking those off because the exhaust can heat up the fuel tank over a long drive.
It is amazing what you can think is wrong with your car when it is just a heat shield.
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