i have a 96 integra gsr. in an effort to pass smog i put the stock back back in. a few days into driving i notice a bubble sound, like someone blowing air into water. well i put the short ram back in and it's still making the sound. prior to putting back the stock box it has never made that sound.

heres my link to what it sounds like. anyone know what the issue is?
http://www.youtube.com/watch?v=NN1OUDWwqPA

 

the put,put,put,put,put,put, is new to me. the other sound has always been there.