Have any of you changed any of this? Cut the flaps out or left the MDS activated and cut the flaps out. I was going to get a full exhaust put in but the guy did not want to go ahead and remove the flaps for fear it could mess with the MDS. Any good information would come in handy. I only have a K&N CAI and I believe he installed some flowmaster mufflers with some different piping but did not remove those flaps.