depends on what type of intake u wanna get.. u can go cold air which in raining season its a no no .. u can go short ram and get improved throttle response and maybe 5 to 7 horses.. and or you can go whale penis that under a good tune can put out as much as 18hp.. but its all about the tune and it seems like you dont have many modifications much less an aftermarket tune, so i would keep ur stock air box and call it a day just my .2 cents.... but if you did wanna upgrade short ram or whale penis is ur best bet..