So then, yesterday, i finally took out my stock airbox and converted to a cone.

after install, everything was fine until i started hearing knocking noises, like theres rocks flying around in my engine or something, this only happens when im at about 2800-3000 rpm. it sounds like rocks are flying around making that noise that sounds like something is knocking on eachother. im not sure if its something i should be worried about or if its something i should just ignore. any clues? ill take a video tomorrow or the next day if needed.

 

Open back up the air box and make sure there isn't anything in there..........Like a rock