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My brother has a 99 prelude SH and it has been blowing dark gray smoke out of the exhaust for a while now. All he has done to it is AEM CAI and Apex'i Dunk exhaust. we figured it could be his old, dented air filter so we got a new one but smoke is still comin out. Could it be bad spark plugs, or something more serious? any help would be appreciated.

 
Rep Power: 267

You should check if it burning oil. Thats the common cause of exhaust smoke

 
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well since there is dark smoke comin out its gotta be burning oil. we thought by changing the filter it would help but it didnt, so i dont know what else could be causing it.

 
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Change the oil filter, change the oil, check the head gasket for visible leaks. Do all the easy and cheap stuff before taking it to a shop. Have you noticed any power lose? Does the car make any different off-beat sounds?

 
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No noticeable power loss or off-beat sounds. He is getting an oil change tomorrow so we'll see what happens. thanks for the info