i notice when my car hits 5 thousand rpms and above, there is this loud crackling sound coming from the passenger side.i dont think its a rattle.theres is no sound below 5 thousand rpms.when i drive normally around town there is no sign of it also.i have a 04 enthusiast with hks exhaust.any help appreciated...thanks

 

Get it on the hoist, lift it up with it running and someone in it, listen.