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intake question

  1. 2012 450r Intake ?

    so i just got brand new trx450r 1st one, spent alot on it so my wife dont want me buying to many parts right now. figured 1st thing i could do was upgrade intake an exhaust. My question is if i get one of the K&N filters or velocity is it fine to take the air box out? I saw a buddy had no air...