I've got a '00 mystique 2.5 nonsvt duratec completely stock. when the engine is cold, and also when i engine break, a loud howling sound comes from the air box sometimes. when it's just sitting there doing it, i can open the air box and it goes away and then i close it and it starts up again. i can also get rid of the sound by revving the engine alittle then it goes away... is this just suction issues or something? kinda annoying cause it's so god damn loud at 6:30 in the morning. lol
