I have a B1-04 that I installed in Mar,and did the breakin like I was told to do. I have put 4-5k. mi. on it since then and The sound changed drastically after pulling the trailer last weekend. I can now hear the turbo whistle as long as the truck is moving even when showing no boost on the gauge. I have looked for leaks but can't find anything leaking. the wastegate is set @ 45 psi and I can hit 45 psi no problem. is it normal to be as loud as it is and to just change out of the blue? I actually don't mind the sound but am worried about is it changing out of the blue.