Honda Accord 2009 duplicate air filter?
I bought an air filter from a guy who told me that he had sold his car and was selling the unused parts. After I fit it I notice a drastic change in the sound of the car. And the acceleration has dropped by more than 50% Is this problem because of the air filter or anything else?
My car has run 40000kms and i changed the engine oil and filter from a reputed garage. What can possibly be the problem?
Please help. 
Put the old filter back in and see what happens. Also are you sure that the filter duct work is back together correctly.
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