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Did you get this figured out? I also had weird dam and knock when I went stage 1+ it was the cobb intake. Air filter has to be 1" exactly from the end of the intake tube. I ditched it and went Grimmspeed stealth intake and got a protune, best move ever. In your cSe the intake isn't doing anything for you. I would go back to stock airbox and run stage 1 until you are ready for next steps and a protune or e tune.