My work truck is a 2012 GMC 2500 with the Dmax. Everything i get on the throttle and it gets to about 2 grand it makes and loud like Gargling or Gurgling noise. Sounds like the intake maybe. Im not quite sure if its suppose to do that lol. My truck and another foremans does it. But no other one. Any ideas on what this could be or is it suppose to do that. I know the older dmax's didnt do that. Thanks guy