I just purchased the Applied Racing Smog Delete Kit in preparation of the standard "free" mods that I will be doing to my 450X this week. However, when I went to the Applied site to order the kit, it recommended the "vent kit" as well. Of course, I purchased it , but I don't know what the heck it really does. Has anyone out there installed this kit? What were the results/ what does it really do. All I can tell is that it puts a filter in-line with the crankcase breather to prevent oil mist from entering in to the carb for burning? So, is the intent to prevent fouled plugs and prevent the motor from burning oil???? Does anyone know????