Well...I got injen CAI and changed to the metal filter. Anyways, the engine shakes and makes rattle noise only in hard rains. I didn't get this when i had injen filter. Ever since I changed it, it starts to rattle and scares the crap outta me. I am scared I might hydrolock it. Could it be from different filter that can suck up water more than Injen one?? I did not go over the puddle but only does that when it rains really hard~