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i have an 07 V6 with ford racing dual exhaust. since installing it at certain rpms i hear a rattling sound from under the car. it usually happens when i pu tit in reverse, when it hit between 2 and 3thousand rpms. im wondering if it could be a hanger or something. i also have a squeaking sound coming from the engine. it occurs right at startup and throughout the rpms range. im thinking one of my belts could be loose. any thoughts??
 

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The exhaust is making contact with some other part. Put the car on a lift or jack stands, grab the pipes along their route and move them back and forth to find out where.

You only have one belt, and it is tensioned by an idler pulley, which is a "lifetime" lubricated part. The belt might be worn or the tensioner out of grease. The belts last over 100k miles and I'm not sure of the life of the tensioner; probably not much more than that.
 
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