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How is the car running? Is it idling properly and have power?. What type of roar is it? Is it coming from the engine compartment, or is it a roar from the exhaust? If it is coming from the engine, I would say it maybe coming from the timing belt, and or tensioner (if the noise wasn't there before.) Did he just change the belt or did he use a timing kit which would include the timing belt(s), tensioner(s), and/or tensioner pulley(s)?
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