Sven has good point there. if it run fine then don't mess w it. If you have too then i would recommend .31 int, .76 main, .48 air bleed and go from there. What brand is your spike air filter? Do you have a picture of the mounting bracket? Depending on that bracket, some must remove aux vent plug and some does not. if you can post a pic of the back side, we will let you know if aux vent plug need to be remove. GL.