ok so, before i start taking things apart, i figured i would see if anyone else has the same problem. Recently i got ahold of a rcd cac tube, and a custom hot tube, by the way the rcd piece is very nice, and worth the money, but anyway heres the issue. At about 20 pounds of boost ocassionally 18 or 19 i get a strange coughing almost like a intercool boot with a tear or crack in it kind of noise, but then as soon as it hits 22, or 23 its gone. completley gone, all the way up to 53 pounds nothing it's fine. ive inspected all the boots. everythings fine. Maybe its oil coming up from the bottom of the intercooler, blowing through the cac tube, and into my motor??? any ideas???? thoughts??? anyone, it's driving me crazy. thanks guys.