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It's weird. My stock air box is making a popping sound..I can pop the hood and rev it through the throttle and clearly hear a thumping/popping sound from my air box..I replaced the k&n with a normal Purolator and it stopped a bit but is still there, I took the air silencer off months ago could that attribute to it?
 

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It's weird. My stock air box is making a popping sound..I can pop the hood and rev it through the throttle and clearly hear a thumping/popping sound from my air box..I replaced the k&n with a normal Purolator and it stopped a bit but is still there, I took the air silencer off months ago could that attribute to it?
I can't say I know what causes it but my car was doing that as well and I got a cold air intake and it went away
 
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