I have a 2007 f250 6.0 with egr delete, studs, gaskets, sct. The other day i was driving to the beach and started to hear a loud whistle or whine from under the hood.so i pulled over but it stopped. Only seems tohappen when foots on the pedal. A little bit of turbo lag not a huge diff. What could this be? Btw i checked boots best i could didnt feel any rips.