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 box just the filter and cover over it? Pro's, Con's?? Also have no idea what is good or bad Name brands for this thing i youtubed different exhaust sounds best i could do, is Two Brothers V.A.L.E. M-7 exhaust any good? Appreciate any help. Thanks.