Found this part from a tea kettle in the air cleaner track. This goes in upside down so you don't really see it through the screen from the top. It's intention is to quiet the intake. Out it goes. I ordered the one from a YZ. I could imagine one could just grind the plastic nubs off to remove it. I will confirm if the YZ is the same part minus the tea kettle. Other issues are the competition ECU and new throttle stop.(On order.) I didn't take the pipe apart since I put a Pro Circuit ti. pipe on it. So for those wishing to keep the stock pipe it appears you can undue the allen heads to get into the pipe and remove the pea shooter. It's a very very small hole stock for a 450. Anyone removing the stock pipe it's a very tight fit and the middle U comes out from the right with a swift tug.