Just got an '03 WR450f a few weeks ago and have got so much help from the members on Thumper Talk. Just joined the forums tonight so I could search the posts. I am trying to figure out how to know if the restrictor plate has been removed from my air box. I need to know so that I can select the correct jet to install. Am I just supposed to remove the plastic that is between the two ports that go down toward the air filter? Thanks in advance for any help you can offer.