recently my car started making a strange noise once i get up to 25mph. its a ticking sort of noise almost like a vaccum or exhuast leak. it changes pitch as i climb through the powerband. some days i dont hear it and some days its louder than others. i checked for loose hoses and couldnt find any. i havent checked the exhaust yet. its hard to find where its coming from since it only makes it at 25mph and up. any ideas?

 

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