Hey guys, just had a few questions about them and wondered what you thought about them. First off, I have heard both ends saying they are worth it and can feel a little bit of difference, but have also heard not worth it and can't feela difference at all. What do you guys think? Also I have heard about a whistling noise? Something about smooth bore gets a whistling noise where the others do not? What does this whisteling sound like? Is it annoying or does it make it sound something like a turbo-type of whistle? And I am looking at buying the Trans-dapt or Airaid from Summit Racing.